The National Epidemiology Center of the Department of Health together with the Provincial Public Health Office of Bulacan and Municipal Health Office of Calumpit conducted rectal swabbing to the 111 victims of food poisoning who were hospitalized at the Calumpit District Hospital after attending a birthday party in Bgy. Meysulao, Calumpit, Bulacan. It aims to identify what kind of microorganisms caused the diarrhea and vomitting of the victims.