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I read the recent publication on Mycobacterium avium subsp. paratuberculosis (MAP) in the environment of dairy herds by Pillars et al (1) with great interest. Pillars et al (1) reached the conclusion that “Environmental contamination with MAP is consistent over time on infected dairy farms, and management practices to reduce environmental contamination are warranted.” Indeed, the problem of contamination is confirmed. A similar study from California was recently reported (2). However, an interesting point is the seasonal variation and other variations due to environmental fluctuation (such as humidity and temperature) that are hardly reported. In Norway, the peak of MAP detection in milk from dairy goats was reported to be in February to March (3). An additional study on the correlation between geographical parameters and the rate of contamination for the case in Michigan might be useful. The data can be helpful in surveillance plans for foodborne disease control.