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Parasites from swine faeces were examined for autofluorescence. Oocysts ofEimeria polita,E. scabraandIsospora suis, cysts ofBalantidium coliand eggs ofOesophagostomum dentatum,Strongyloides ransomiandTrichuris suis(but not those ofAscaris suum) emitted light after excitation with UV light.I. suisoocyst counts in McMaster chambers utilising autofluorescence were compared to those from conventional bright field microscopy. Similarly, faecal smears containingI. suiswere examined using the same techniques. Autofluorescence was superior to bright field microscopy in detecting oocysts after flotation and was highly significantly more sensitive when direct smears were examined.