Dengue's Evolving Threat: Multiple Virus Strains Raise Severity and Vaccination Challenges

India's dengue epidemic is entering a new and dangerous phase, with all four virus serotypes now circulating together across much of the country, according to a two-year nationwide surveillance study by the Indian Council of Medical Research's Virus Research and Diagnostic Laboratory network. The study, titled "Pan-India Molecular Surveillance of Dengue Serotypes, 2023–2025," analyzed 6,889 laboratory-confirmed dengue samples from 45 laboratories across **25 states and...