Journal of the Medical Association of Thailand Vol 92, No 6:JUNE 2009 (SUPPL.3) 0125-2208 92 6 2009 Jun The Prevalence of Anti-hepatitis E in Occupational Risk Groups 38 EN Pavin Pourpongporn Kwonchit Samransurp Pornpun Rojanasang Supaporn Wiwattanakul Surangrat Srisurapanon Original Article Agricultural workers’ diseases Hepatitis E virus Occupational diseases Prevalence Risk factors Swine Zoonoses