Emergence of Plasmodium malariae and Co-endemicity of 3 Plasmodium Species Parasites, Khanh Hoa Province, Vietnam, 2023–2025

A large malaria outbreak caused by Plasmodium malariae parasites occurred in Khanh Hoa Province, Vietnam, in 2023. Since then, P. malariae parasites have persisted in the region alongside P. falciparum and P. vivax species, changing malaria patterns. Those findings reinforce the need for strengthened surveillance in the region.