New Delhi: The Union Ministry of Health and Family Welfare has deployed a National Joint Outbreak Response Team (NJORT) to Gujarat and Rajasthan to strengthen the response to the ongoing Chandipura Virus Disease (CHPV) outbreak.
The deployment comes against the backdrop of sustained and intensified scientific investigations by a nationwide network of premier research institutions, alongside continuous disease surveillance under the Integrated Disease Surveillance Programme (IDSP).
The deployment is coordinated by the National Centre for Disease Control (NCDC) in close collaboration with State Surveillance Units.
These coordinated efforts are aimed at advancing the understanding of the virus, including its transmission dynamics, clinical spectrum, epidemiology and potential treatment approaches, while guiding evidence-based public health interventions.
The NCDC Public Health Emergency Operations Centre (PHEOC) has also been activated to support the NJORT.
The multidisciplinary NJORT, comprising experts from the National Centre for Disease Control (NCDC), the Indian Council of Medical Research (ICMR) and the Department of Animal Husbandry and Dairying (DAHD), will supplement the efforts of the two State governments in outbreak investigation.
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They will also help in epidemiological assessment, clinical management, laboratory coordination, vector surveillance and implementation of public health measures. The team will work closely with State health departments to review the on-ground response and submit recommendations to the Ministry after completing its field assessment.
The deployment comes amid one of the most comprehensive scientific investigations undertaken for Chandipura virus in recent years.
As part of the investigation, active surveillance has been intensified among patients presenting with Acute Febrile Illness (AFI) and AES in affected districts, while community-based serosurveys are being conducted to estimate asymptomatic infections and assess the true extent of virus transmission.
A key focus of the investigation is to unravel the virus transmission cycle. While sandflies are the established vectors of Chandipura virus, scientists are also examining whether other arthropods—including mosquitoes, ticks and mites—may have a role in transmission. Large numbers of vector samples collected from affected areas are currently undergoing laboratory analysis. Officials have emphasised that it is premature to identify the vector responsible for the current outbreak until scientific investigations are completed.
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Animal surveillance has also been expanded to determine whether the virus is circulating among domestic animals that could potentially act as reservoirs. Blood samples from cattle, buffaloes and goats, along with milk samples, have been collected for testing. Around 70 animal blood samples have been collected so far and are being analysed for Chandipura virus and other relevant pathogens. Authorities have clarified that no conclusions can be drawn until laboratory investigations are completed.
The ongoing investigations are also drawing upon lessons from the 2024 Chandipura virus outbreak in Gujarat. During that outbreak, several vector species, including sandflies, were collected and tested, but all samples were negative for CHPV, and no specific vector could be conclusively implicated.
Scientists are also closely examining whether the virus has undergone genetic changes. Whole-genome sequencing of virus samples from the current outbreak is being carried out at the Gujarat Biotechnology Research Centre (GBRC), Gandhinagar. Preliminary analysis has identified minor genetic variations, but experts say detailed comparative genomic studies are required before determining whether the currently circulating virus has evolved from strains associated with previous outbreaks.
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