ICMR-National Institute of Virology, Pune

“analysed 6,889 lab-confirmed dengue samples collected through 45 virus research and diagnostic laboratories (VRDLs) across 25 states and UTs between 2023 and 2025.”

“all four dengue serotypes (DENV-1, DENV-2, DENV-3 and DENV-4) were detected simultaneously in Andhra, Gujarat, Haryana, MP, Maharashtra, Rajasthan, Tamil Nadu and West Bengal.”

“Fifteen other states and UTs had three serotypes in circulation, while two reported circulation of two serotypes.”

“DENV-2 to be the dominant circulating strain, accounting for 51% of infections, followed by DENV-3 (13%), DENV-1 (7%) and DENV-4 (1%).”

“About 7% of patients were infected with two or more dengue serotypes simultaneously.”

“patients with concurrent infections were more likely to develop thrombocytopenia, haemorrhagic manifestations and arthralgia than those infected with a single serotype”

“DENV-1 accounted for a relatively larger share of infections in Tamil Nadu (29%), Haryana (38%) and Rajasthan (25%).”

“DENV-3 was more frequently detected in Gujarat (30%), TN(29%), UP (29%) and WB (20%).”