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Some cases are thought to be caused at least in part by childhood streptococcal infections and are termed P.A.N.D.A.S. (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal infections). The streptococcal antibodies become involved in an autoimmune process. Though this idea is not set in stone, if it did prove to be true, there is cause to believe that OCD can to some very small extent be “caught” via exposure to strep throat (just as one may catch a cold). However, if OCD is caused by bacteria, this provides hope that antibiotics may eventually be utilized to treat or prevent it (Belkin, accessed 4/12/06).
OCD in men at least may be partially caused by low oestrogen levels (external link about this is below).