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Confirmed Lyme disease cases by month of disease onset--United States, 2001-2010

While reported cases of Lyme disease can occur year-round, May, June, July, and August are the peak months for being diagnosed with Lyme disease, with June and July being the peak months.  April, September, October, and November have far fewer cases than the summer months, but December, January, February, and March have the fewest cases of reported Lyme disase.

Lyme disease patients are most likely to have illness onset in June, July, or August and less likely to have illness onset from December through March. The U.S. Government's Official Web PortalDepartment of Health and Human Services
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