Among 1,180 symptomatic malaria patients, 9 (0.76%) infected with Plasmodium cynomolgi were co-infected with P. vivax (n = 7), P. falciparum (n = 1), or P. vivax and P. knowlesi (n = 1). Patients were from Tak, Chanthaburi, Ubon Ratchathani, Yala, and Narathiwat Provinces, suggesting P. cynomolgi is widespread in this country.
Keywords: PCR detection; Plasmodium; Plasmodium cynomolgi; Plasmodium falciparum; Plasmodium knowlesi; Plasmodium vivax; Thailand; co-infections; cross-transmission; malaria; mitochondrial cytochrome oxidase I; mixed species malaria infection; parasites; vector-borne infections; zoonoses.