Forty-five suspected chikungunya infections were identified in Playa Langosta, with Costa Rica confirming four cases and classifying 17 others as probable in the Santa Cruz outbreak.
INCIENSA analyzed the samples, and the investigated cases include both Costa Rican citizens and foreign nationals linked to the beach community in Guanacaste.
About 5,000 homes have been fumigated since the outbreak was detected, while health teams also carried out targeted interventions at 638 homes and removed mosquito breeding sites.
The Health Ministry urged residents and visitors in Playa Langosta and nearby areas to use repellent and mosquito nets, clear standing water, and seek care quickly for fever above 39 C, joint pain, headache, nausea or malaise.