Birds from the Area de Conservación Guanacaste in northwestern Costa Rica were surveyed for blood parasites in June 2001 and December 2001–January 2002. Of 354 birds examined, representing 141 species of 35 families and 15 orders, 44 (12.4%) were infected with blood parasites. Species of Haemoproteus (4.8% prevalence), Plasmodium (0.6%), Leucocytozoon (0.3%), Trypanosoma (2.0%), and microfilariae (7.6%) were recorded. Twelve species of birds in this survey were examined for blood parasites for the first time. Several new host-parasite associations were identified.

Journal of Wildlife Diseases
Vol. 40 • No. 3
July 2004
Vol. 40 • No. 3
July 2004
Avian hematozoa
Costa Rica
Haemoproteus
Leucocytozoon
microfilariae
Plasmodium
Trypanosoma