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1.  Cognitive Function in the Community Setting: The Neighborhood as a Source of “Cognitive Reserve”? 
Background
Existing research has found a positive association between cognitive function and residence in a socioeconomically advantaged neighborhood. Yet, the mechanisms underlying this relationship have not been empirically investigated. This study tests the hypothesis that neighborhood socioeconomic structure is related to cognitive function partly through the availability of neighborhood physical and social resources (e.g. recreational facilities, community centers and libraries), which promote cognitively beneficial activities such as exercise and social integration.
Methods
Using data from a representative survey of community-dwelling adults in the City of Chicago (N = 949 adults age 50 and over) we assessed cognitive function with a modified version of the Telephone Interview for Cognitive Status (TICS) instrument. Neighborhood socioeconomic structure was derived from US Census indicators. Systematic Social Observation was used to directly document the presence of neighborhood resources on the blocks surrounding each respondent’s residence.
Results
Using multilevel linear regression, residence in an affluent neighborhood had a net positive effect on cognitive function after adjusting for individual risk factors. For white respondents, the effects of neighborhood affluence operated in part through a greater density of institutional resources (e.g. community centers) that promote cognitively beneficial activities such as physical activity. Stable residence in an elderly neighborhood was associated with higher cognitive function (potentially due to greater opportunities for social interaction with peers), but long term exposure to such neighborhoods was negatively related to cognition.
Conclusions
Neighborhood resources have the potential to promote “cognitive reserve” for adults who are aging in place in an urban setting.
doi:10.1136/jech.2010.128116
PMCID: PMC3387518  PMID: 21515547
cognitive function; neighborhood; urban health; elderly
2.  Social connectedness can inhibit disease transmission: Social organization, cohesion, village context and infection risk in rural Ecuador 
American journal of public health  2012;102(12):2233-2239.
Social network analysis has become central to understanding the spread of infectious diseases and behavioral risks for chronic disease. Networks are typically seen as conduits for spread of disease or risk factors thereof. However, social relationships also reduce incidence of chronic disease, and potentially infectious diseases as well. Seldom are these opposing effects considered simultaneously. We show how and why diarrheal disease spreads more slowly to and within rural Ecuadorian villages that are more remote from the area’s population center. Reduced contact with outside individuals partially accounts for remote villages’ relatively lower prevalence of diarrheal disease. But equally or more important is greater density of social ties between individuals in remote communities, which facilitates spread of individual and collective practices that reduce transmission of diarrheal disease.
doi:10.2105/AJPH.2012.300795
PMCID: PMC3519324  PMID: 23078481
Diarrheal disease; social networks; infectious diseases; social epidemiology; development and health
3.  Variations in Hypertension-Related Outcomes Among Blacks, Whites and Hispanics in Two Large Urban Areas and in the United States 
Ethnicity & disease  2012;22(4):391-397.
Objective
This study compared the hypertension prevalence, awareness, treatment and control in Chicago, Illinois and Detroit, Michigan to that of the general United States population (aged ≥ 25 years) for the period 2001–2003. We examined whether and how much 1) urban populations have less favorable hypertension-related outcomes and 2) the rates of racial/ethnic minorities lag behind those of Whites in order to determine if the national data understate the magnitude of hypertension-related outcomes and racial/ethnic disparities in two large cities in the Midwestern region of the United States and perhaps others.
Methods
Unstandardized and standardized hypertension-related outcome rates were estimated.
Results
The hypertension-related outcomes among Chicago and Detroit residents lag behind the United States by 8%–14% and 10%–18% points, respectively. Additionally, this study highlights the complexity of the racial/ethnic differences in hypertension-related outcomes, where within each population, Blacks were more likely to have hypertension and to be aware of their hypertension status than Whites, and no less likely to be treated. Conversely, Hispanics were less likely to have hypertension and also less likely to be aware of their status when they do have hypertension when compared to Whites.
Conclusion
At a time when efficacious treatment for hypertension has been available for more than 50 years, continued racial/ethnic differences in the prevalence, awareness, treatment and control of hypertension is among public health’s greatest challenges. To achieve the proposed national hypertension-related goals, future policies must consider the social context of hypertension within central cities of urban areas. (Ethn Dis. 2012;22[4]:391–397)
PMCID: PMC3579519  PMID: 23140067
Hypertension; Minority Health; Population; Urban Health
4.  The Unequal Burden of Weight Gain: An Intersectional Approach to Understanding Social Disparities in BMI Trajectories from 1986 to 2001/2002 
The implications of recent weight gain trends for widening social disparities in body weight in the United States are unclear. Using an intersectional approach to studying inequality, and the longitudinal and nationally representative American’s Changing Lives study (19862001/2002), we examine social disparities in body mass index trajectories during a time of rapid weight gain in the United States. Results reveal complex interactive effects of gender, race, socioeconomic position and age, and provide evidence for increasing social disparities, particularly among younger adults. Most notably, among individuals who aged from 25–39 to 45–54 during the study interval, low-educated and low-income black women experienced the greatest increase in BMI, while high-educated and high-income white men experienced the least BMI growth. These new findings highlight the importance of investigating changing disparities in weight intersectionally, using multiple dimensions of inequality as well as age, and also presage increasing BMI disparities in the U.S. adult population.
doi:10.1093/sf/sor001
PMCID: PMC3570259  PMID: 23413316
5.  Language of Interview, Self-Rated Health, and the Other Latino Health Puzzle 
American journal of public health  2010;101(7):1306-1313.
Objectives
Despite lower rates of mortality and some forms of morbidity, Latinos report worse self-rated health (SRH) than Whites. These inconsistencies have raised questions about the validity of SRH for cross-ethnic comparisons and its use as a measure of health disparities. We examine whether the translation of this measure into Spanish helps explain these patterns.
Methods
We analyzed levels of SRH under different language conditions using cross-sectional data from the 2002 Chicago Community Adult Health Study and the 2003 Behavioral Risk Factor Surveillance System.
Results
Being interviewed in Spanish was associated with significantly higher odds of rating one’s health as fair/poor in both data sets, and adjusting for language of interview substantially reduced the SRH gap between whites and Latinos. Spanish-language interviewees were also more likely to rate their health as “fair” (“regular” in Spanish) than any other response category, after adjusting for age, sex, socioeconomic position, health conditions, and other factors. The association between being interviewed in Spanish and reporting “fair”/“regular” health was strongest when contrasted against response categories representing better health (good, very good, and excellent).
Conclusion
The findings support the hypothesis that the translation of the English word “fair” to “regular” induces Spanish-speaking respondents to report worse levels of health than they otherwise would in English. We recommend caution in interpreting this widely used instrument—especially when making racial/ethnic comparisons—and propose experimental research using different translations of this measure to arrive at one that better equates its meaning in Spanish and English.
doi:10.2105/AJPH.2009.175455
PMCID: PMC3110226  PMID: 21164101
6.  Education and levels of salivary cortisol over the day in U.S. adults 
Background
Dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis is hypothesized to be an important pathway linking socioeconomic position and chronic disease.
Purpose
This paper tests the association between education and the diurnal rhythm of salivary cortisol.
Methods
Up to 8 measures of cortisol (mean of 5.38 per respondent) over two days were obtained from 311 respondents, aged 18–70, drawn from the 2001–2002 Chicago Community Adult Health Study. Multi-level models with linear splines were used to estimate waking level, rates of cortisol decline, and area-under-the-curve over the day, by categories of education.
Results
Lower education (0–11 years) was associated with lower waking levels of cortisol, but not the rate of decline of cortisol, resulting in a higher area-under-the-curve for more educated respondents throughout the day.
Conclusions
This study found evidence of lower cortisol exposure among individuals with less education and thus does not support the hypothesis that less education is associated with chronic over-exposure to cortisol.
doi:10.1007/s12160-010-9224-2
PMCID: PMC3486742  PMID: 20812036
7.  Neighborhood Context and Social Disparities in Cumulative Biological Risk Factors 
Psychosomatic medicine  2011;73(7):572-579.
Objective
This study examines the role of neighborhood context in the accumulation of biological risk factors and racial/ethnic and socioeconomic disparities.
Method
Data come from face-to-face interviews and blood collection on a probability sample of adults (n=549) in the 2002 Chicago Community Adult Health Study. Following the approach of prior studies, we constructed an index of cumulative biological risk (CBR) by counting how many of eight biomarkers exceeded clinically defined criteria for “high risk”: systolic and diastolic blood pressure, resting heart rate, hemoglobin A1c, C-reactive protein, waist size, and total and HDL cholesterol. Data are presented as incidence rate ratios (IRR) based on generalized linear models with a Poisson link function and population-average estimates with robust standard errors.
Results
Non-Hispanic blacks (n=200), Hispanics (n=149), and people with low (n=134) and moderate (n=275) education had significantly higher numbers of biological risks than their respective reference groups (IRR=1.48, 1.59, 1.62, and 1.48, respectively, with p-values <0.01). Black-white (p<0.001) and Hispanic-white (p<0.003) disparities in CBR remained significant after adjusting for individual-level socioeconomic position and behavioral factors, while individual-level controls substantially diminished the low/high (p<0.069) and moderate/high (p<0.042) educational differences. Estimating “within-neighborhood” disparities to adjust for neighborhood context fully explained the black-white gap in CBR (p<0.542) and reduced the Hispanic-white gap to borderline significance (p<0.053). Neighborhood affluence predicted lower levels of CBR (IRR=0.82, p<0.027), but neighborhood disadvantage was not significantly associated with CBR (IRR=1.00, p<0.948).
Conclusions
Neighborhood environments appear to play a pivotal role in the accumulation of biological risk and disparities therein.
doi:10.1097/PSY.0b013e318227b062
PMCID: PMC3216672  PMID: 21862824
social environment; health disparities; cumulative biological risk; allostatic load; risk factor
8.  The Social Structuring of Mental Health over the Adult Life Course: Advancing Theory in the Sociology of Aging 
The sociology of aging draws on a broad array of theoretical perspectives from several disciplines, but rarely has it developed its own. We build on past work to advance and empirically test a model of mental health framed in terms of structural theorizing and situated within the life course perspective. Whereas most prior research has been based on cross-sectional data, we utilize four waves of data from a nationally representative sample of American adults (Americans' Changing Lives Study) collected prospectively over a 15-year period and find that education, employment and marital status, as well as their consequences for income and health, effectively explain the increase in depressive symptoms after age 65. We also found significant cohort differences in age trajectories of mental health that were partly explained by historical increases in education. We demonstrate that a purely structural theory can take us far in explaining later life mental health.
doi:10.1353/sof.2011.0036
PMCID: PMC3210581  PMID: 22081728
9.  Socioeconomic and Behavioral Risk Factors for Mortality in a National 19-Year Prospective Study of U.S. Adults 
Social science & medicine (1982)  2010;70(10):1558-1566.
Many demographic, socioeconomic, and behavioral risk factors predict mortality in the United States. However, very few population-based longitudinal studies are able to investigate simultaneously the impact of a variety of social factors on mortality. We investigated the degree to which demographic characteristics, socioeconomic variables and major health risk factors were associated with mortality in a nationally-representative sample of 3,617 U.S. adults from 1986-2005, using data from the 4 waves of the Americans’ Changing Lives study. Cox proportional hazard models with time-varying covariates were employed to predict all-cause mortality verified through the National Death Index and death certificate review. The results revealed that low educational attainment was not associated with mortality when income and health risk behaviors were included in the model. The association of low-income with mortality remained after controlling for major behavioral risks. Compared to those in the “normal” weight category, neither overweight nor obesity was significantly associated with the risk of mortality. Among adults age 55 and older at baseline, the risk of mortality was actually reduced for those were overweight (hazard rate ratio=0.83, 95% C.I. = 0.71 – 0.98) and those who were obese (hazard rate ratio=0.68, 95% C.I. = 0.55 – 0.84), controlling for other health risk behaviors and health status. Having a low level of physical activity was a significant risk factor for mortality (hazard rate ratio=1.58, 95% C.I. = 1.20 – 2.07). The results from this national longitudinal study underscore the need for health policies and clinical interventions focusing on the social and behavioral determinants of health, with a particular focus on income security, smoking prevention/cessation, and physical activity.
doi:10.1016/j.socscimed.2010.02.003
PMCID: PMC3337768  PMID: 20226579
Mortality; socioeconomic factors; health behavior; Unites States; obesity
10.  Hopelessness, Depression, and Early Markers of Endothelial Dysfunction in U.S. adults 
Psychosomatic medicine  2010;72(7):613-619.
Objective
This study examines whether the psychological traits of hopelessness and depressive symptoms are related to endothelial dysfunction.
Methods
Data come from a subsample of 434 respondents in the 2001–2003 Chicago Community Adult Health Study (CCAHS), a population-based survey designed to study the impact of psychological attributes, neighborhood environment, and socio-economic circumstances on adults age 18 and over. Circulating biomarkers of endothelial dysfunction including e-selectin, p-selectin and s-ICAM1 were obtained from serum samples. Hopelessness was measured by responses to two questions and depressive symptoms were measured by an 11-item version of the CES-D. Multivariate regression models tested whether continuous levels of the biomarkers (natural log transformed) were associated with levels of hopelessness and depressive symptoms separately and concurrently.
Results
In age- and sex-adjusted models, hopelessness showed significant positive linear associations with s-ICAM1. In contrast, there was no significant linear association between hopelessness and e-selectin and p-selectin. Adjustment for clinical risk factors including systolic pressure, chronic health conditions, smoking, and body mass index did not substantively alter these associations. Results from similar models for depressive symptoms did not reveal any association with the three biomarkers of endothelial dysfunction. The associations between hopelessness and e-selectin and s-ICAM1 were robust to the inclusion of adjustments for depressive symptoms.
Conclusions
Negative psychosocial traits may influence cardiovascular outcomes partially through their impact on the early stages of atherosclerosis, and specific psychosocial traits such as hopelessness may play a more direct role in this process than overall depressive symptoms.
doi:10.1097/PSY.0b013e3181e2cca5
PMCID: PMC3190596  PMID: 20498292
11.  Social security and mortality: The role of income support policies and population health in the United States 
Journal of public health policy  2011;32(2):234-250.
Social Security is the most important and effective income support program ever introduced in the United States, alleviating the burden of poverty for millions of elderly Americans. We explored the possible role of Social Security in reducing mortality among the elderly. In support of this hypothesis, we found that declines in mortality among the elderly exceeded those among younger age groups following the initial implementation of Social Security in 1940, and also in the periods following marked improvements in Social Security benefits via legislation and indexing of benefits that occurred between the mid-1960s and the early 1970s. A better understanding of the link between Social Security and health status among the elderly would add a significant and missing dimension to the public discourse over the future of Social Security, and the potential role of income support programs in reducing health-related socioeconomic disparities and improving population health.
doi:10.1057/jphp.2011.2
PMCID: PMC3148579  PMID: 21326333
Social Security; income support; social epidemiology; health policy
12.  Measurement of the Local Food Environment: A Comparison of Existing Data Sources 
American Journal of Epidemiology  2010;171(5):609-617.
Studying the relation between the residential environment and health requires valid, reliable, and cost-effective methods to collect data on residential environments. This 2002 study compared the level of agreement between measures of the presence of neighborhood businesses drawn from 2 common sources of data used for research on the built environment and health: listings of businesses from commercial databases and direct observations of city blocks by raters. Kappa statistics were calculated for 6 types of businesses—drugstores, liquor stores, bars, convenience stores, restaurants, and grocers—located on 1,663 city blocks in Chicago, Illinois. Logistic regressions estimated whether disagreement between measurement methods was systematically correlated with the socioeconomic and demographic characteristics of neighborhoods. Levels of agreement between the 2 sources were relatively high, with significant (P < 0.001) kappa statistics for each business type ranging from 0.32 to 0.70. Most business types were more likely to be reported by direct observations than in the commercial database listings. Disagreement between the 2 sources was not significantly correlated with the socioeconomic and demographic characteristics of neighborhoods. Results suggest that researchers should have reasonable confidence using whichever method (or combination of methods) is most cost-effective and theoretically appropriate for their research design.
doi:10.1093/aje/kwp419
PMCID: PMC2842213  PMID: 20123688
Chicago; geographic information systems; reproducibility of results; residence characteristics; social environment
13.  Racial and Socioeconomic Disparities in Residential Proximity to Polluting Industrial Facilities: Evidence From the Americans’ Changing Lives Study 
American journal of public health  2009;99(Suppl 3):S649.
Objectives
We sought to demonstrate the advantages of using individual-level survey data in quantitative environmental justice analyses and to provide new evidence regarding racial and socioeconomic disparities in the distribution of polluting industrial facilities.
Methods
Addresses of respondents in the baseline sample of the Americans’ Changing Lives Study and polluting industrial facilities in the Environmental Protection Agency’s Toxic Release Inventory were geocoded, allowing assessments of distances between respondents’ homes and polluting facilities. The associations between race and other sociodemographic characteristics and living within 1 mile (1.6 km) of a polluting facility were estimated via logistic regression.
Results
Blacks and respondents at lower educational levels and, to a lesser degree, lower income levels were significantly more likely to live within a mile of a polluting facility. Racial disparities were especially pronounced in metropolitan areas of the Midwest and West and in suburban areas of the South.
Conclusions
Our results add to the historical record demonstrating significant disparities in exposures to environmental hazards in the US population and provide a paradigm for studying changes over time in links to health.
doi:10.2105/AJPH.2007.131383
PMCID: PMC2774179  PMID: 19890171
14.  Perceived job insecurity and worker health in the United States 
Social science & medicine (1982)  2009;69(5):777-785.
Economic recessions, the industrial shift from manufacturing toward service industries, and rising global competition have contributed to uncertainty about job security, with potential consequences for workers’ health. To address limitations of prior research on the health consequences of perceived job insecurity, we use longitudinal data from two nationally-representative samples of the United States population, and examine episodic and persistent perceived job insecurity over periods of about three years to almost a decade. Results show that persistent perceived job insecurity is a significant and substantively important predictor of poorer self-rated health in the American’s Changing Lives (ACL) and Midlife in the United States (MIDUS) samples, and of depressive symptoms among ACL respondents. Job losses or unemployment episodes are associated with perceived job insecurity, but do not account for its association with health. Results are robust to controls for sociodemographic and job characteristics, negative reporting style, and earlier health and health behaviors.
doi:10.1016/j.socscimed.2009.06.029
PMCID: PMC2757283  PMID: 19596166
USA; perceived job insecurity; self-rated health; depressive symptoms
15.  Mobility Disability and the Urban Built Environment 
American Journal of Epidemiology  2008;168(5):506-513.
Research on the effects of the built environment in the pathway from impairment to disability has been largely absent. Using data from the Chicago Community Adult Health Study (2001–2003), the authors examined the effect of built environment characteristics on mobility disability among adults aged 45 or more years (n = 1,195) according to their level of lower extremity physical impairment. Built environment characteristics were assessed by using systematic social observation to independently rate street and sidewalk quality in the block surrounding each respondent's residence in the city of Chicago (Illinois). Using multinomial logistic regression, the authors found that street conditions had no effect on outdoor mobility among adults with only mild or no physical impairment. However, among adults with more severe impairment in neuromuscular and movement-related functions, the difference in the odd ratios for reporting severe mobility disability was over four times greater when at least one street was in fair or poor condition (characterized by cracks, potholes, or broken curbs). When all streets were in good condition, the odds of reporting mobility disability were attenuated in those with lower extremity impairment. If street quality could be improved, even somewhat, for those adults at greatest risk for disability in outdoor mobility, the disablement process could be slowed or even reversed.
doi:10.1093/aje/kwn185
PMCID: PMC2727170  PMID: 18667526
aging; lower extremity; mobility limitation; social environment; urban health
16.  Understanding Social Disparities in Hypertension Prevalence, Awareness, Treatment, and Control: The Role of Neighborhood Context 
Social science & medicine (1982)  2007;65(9):1853-1866.
The spatial segregation of the U.S. population by socioeconomic position and especially race-ethnicity suggests that the social contexts or “neighborhoods” in which people live may substantially contribute to social disparities in hypertension. The Chicago Community Adult Health Study did face-to-face interviews, including direct measurement of blood pressure, with a representative probability sample of adults in Chicago. These data were used to estimate socioeconomic and racial-ethnic disparities in the prevalence, awareness, treatment, and control of hypertension, and to analyze how these disparities are related to the areas in which people live. Hypertension was significantly negatively associated with neighborhood affluence/gentrification, and adjustments for context eliminated the highly significant disparity between blacks/African-Americans and whites, and reduced the significant educational disparity by 10–15% to borderline statistical significance. Awareness of hypertension was significantly higher in more disadvantaged neighborhoods and in places with higher concentrations of blacks (and lower concentrations of Hispanics and immigrants). Adjustment for context completely eliminated blacks’ greater awareness, but slightly accentuated the lesser awareness of Hispanics and the greater levels of awareness among the less educated. There was no consistent evidence of either social disparities in or contextual associations with treatment of hypertension, given awareness. Among those on medication, blacks were only 40–50% as likely as whites to have their hypertension controlled, but context played little or no role in either the level of or disparities in control of hypertension. In sum, residential contexts potentially play a large role in accounting for racial-ethnic, and to a lesser degree, socioeconomic disparities in hypertension prevalence and, in a different way, awareness, but not in treatment or control of diagnosed hypertension.
doi:10.1016/j.socscimed.2007.05.038
PMCID: PMC2705439  PMID: 17640788
Neighborhoods; social disparities; multi-level modeling; health inequalities; hypertension; blood pressure
17.  Social and Physical Environments and Disparities in Risk for Cardiovascular Disease: The Healthy Environments Partnership Conceptual Model 
Environmental Health Perspectives  2005;113(12):1817-1825.
The Healthy Environments Partnership (HEP) is a community-based participatory research effort investigating variations in cardiovascular disease risk, and the contributions of social and physical environments to those variations, among non-Hispanic black, non-Hispanic white, and Hispanic residents in three areas of Detroit, Michigan. Initiated in October 2000 as a part of the National Institute of Environmental Health Sciences’ Health Disparities Initiative, HEP is affiliated with the Detroit Community–Academic Urban Research Center. The study is guided by a conceptual model that considers race-based residential segregation and associated concentrations of poverty and wealth to be fundamental factors influencing multiple, more proximate predictors of cardiovascular risk. Within this model, physical and social environments are identified as intermediate factors that mediate relationships between fundamental factors and more proximate factors such as physical activity and dietary practices that ultimately influence anthropomorphic and physiologic indicators of cardiovascular risk. The study design and data collection methods were jointly developed and implemented by a research team based in community-based organizations, health service organizations, and academic institutions. These efforts include collecting and analyzing airborne particulate matter over a 3-year period; census and administrative data; neighborhood observation checklist data to assess aspects of the physical and social environment; household survey data including information on perceived stressors, access to social support, and health-related behaviors; and anthropometric, biomarker, and self-report data as indicators of cardiovascular health. Through these collaborative efforts, HEP seeks to contribute to an understanding of factors that contribute to racial and socioeconomic health inequities, and develop a foundation for efforts to eliminate these disparities in Detroit.
doi:10.1289/ehp.7913
PMCID: PMC1314928  PMID: 16330371
community-based participatory research partnerships; racial segregation and cardiovascular disease; social and physical environments and cardiovascular disease
20.  Rotavirus-Like, Calicivirus-Like, and 23-nm Virus-Like Particles Associated with Diarrhea in Young Pigs † 
Journal of Clinical Microbiology  1980;12(1):105-111.
Virus particles morphologically similar to caliciviruses and rotaviruses were detected by electron microscopy (EM) in the intestinal contents of a 27-day-old diarrheic nursing pig. A third small spherical 23-nm virus-like particle was also observed. Calicivirus-like particles averaged 33 nm in diameter. Similar to rotaviruses, rotavirus-like particles were present as single-capsid 55-nm forms or double-capsid 70-nm particles. Most gnotobiotic pigs orally exposed to samples containing these three viruses developed diarrhea and villous atrophy of the small intestine, and all shed the three viruses in their intestinal contents. Attempts to propagate these viruses in cell culture were unsuccessful. The antigenic relationship of the rotavirus-like particles to known rotaviruses was explored by immune EM and immunofluorescent staining. By these techniques, the rotavirus-like particles did not cross-react with antisera to porcine, bovine, or human rotaviruses or to reovirus type 3. Antisera from gnotobiotic pigs exposed to all three viruses had enzyme-linked immunosorbent assay and virus neutralization titers of <4 against porcine rotavirus. Previous infection of gnotobiotic pigs with the mixture containing rotavirus-like particles failed to protect them against a subsequent challenge with porcine rotavirus. The antigenic relationship of the calicivirus-like particles to known caliciviruses was investigated by immune EM and virus neutralization. By these tests, the calicivirus-like particles did not react with antisera against feline calicivirus strain 255 or M-8. In a study conducted at Plum Island Animal Disease Center, antiserum against the three combined agents did not specifically neutralize any serotype of swine vesicular exanthema virus.
Images
PMCID: PMC273530  PMID: 6252238

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