New Delhi: Gujarat has recorded 41 laboratory-confirmed Chandipura virus infections and 27 deaths since surveillance for the current outbreak began on June 30, highlighting the disease’s capacity to deteriorate rapidly in children. The monsoon-season outbreak has prompted intensified surveillance, insect-control operations and a multi-agency investigation into how widely the virus is circulating and which vectors are driving its transmission.
State health department figures, updated at 5pm on Friday, showed 257 suspected cases, with laboratory results available for 246 patients and reports on 11 samples still awaited. Of those tested, 41 were confirmed to have Chandipura virus.
The suspected-case count should not be mistaken for the number of confirmed Chandipura infections because acute encephalitis syndrome can be caused by several viruses, bacteria and other conditions. Laboratory testing is therefore necessary to establish whether a patient’s neurological illness was caused by Chandipura virus or another pathogen.
The figures mark a sharp rise from July 21, when Gujarat had reported 63 suspected cases and 12 confirmed infections, with eight results pending. Health authorities have since expanded door-to-door screening, insecticide spraying, sanitation drives and awareness campaigns, particularly around homes and cattle sheds in affected areas.
The Centre has also deployed a National Joint Outbreak Response Team to Gujarat and Rajasthan, bringing together specialists from the NCDC, Indian Council of Medical Research and Department of Animal Husbandry and Dairying. The team is examining the outbreak’s epidemiology, clinical pattern, laboratory diagnosis and possible transmission cycle while helping the states strengthen patient management and vector control.
Scientists are collecting sandflies and other arthropods for testing and conducting serological surveys to identify infections that may have caused mild symptoms or none at all. Animal blood and milk samples are also being analysed to determine whether cattle, buffaloes, goats or other domestic animals have any role in sustaining the virus, although the Union health ministry has cautioned that no conclusion can be drawn before the investigations are completed.
Why Chandipura virus can become a neurological emergency
Chandipura virus is an RNA virus belonging to the Rhabdoviridae family, which also includes the rabies virus, although the two cause different diseases and spread in different ways. It was first isolated in 1965 from the blood of two adults suffering from fever in Chandipura village in Maharashtra’s Nagpur region, from which it derives its name.
The infection has subsequently been associated with sporadic cases and outbreaks of acute encephalitis syndrome, principally in western, central and southern India. Children below 15 have accounted for most severe cases during documented outbreaks, although infection is not biologically restricted to that age group.
Sandflies are the best-established vectors, transmitting the virus through their bites after acquiring it from an infected host or reservoir. The World Health Organization says mosquitoes and ticks may also act as vectors, but investigators have not yet established which insect species is responsible for the present outbreak.
The Centre has said that researchers are testing sandflies, mosquitoes, ticks and mites collected in affected areas, reflecting the remaining gaps in knowledge about the virus’s ecology. No human-to-human transmission has been documented, according to the WHO’s assessment of India’s 2024 outbreak, meaning the illness is not known to spread through ordinary contact, coughing, food or water.
Poor sanitation and housing with cracks in walls can provide sandflies with breeding and resting sites, while the monsoon produces conditions favourable for larger vector populations. People living in rural or semi-rural settings with close human, animal and insect contact can consequently face greater exposure, though infection can occur wherever competent vectors are present.
Symptoms usually begin abruptly with high fever, severe headache, fatigue and vomiting. Some patients then develop confusion, irritability, altered consciousness, seizures or convulsions as the infection progresses to encephalitis – inflammation of the brain.
In severe childhood cases, deterioration can occur within 24 to 72 hours, progressing from an apparently routine fever to coma, respiratory difficulty and death. A child with sudden fever accompanied by repeated vomiting, unusual drowsiness, disorientation, seizures or loss of consciousness therefore requires immediate hospital assessment.
Chandipura virus is considered highly lethal among patients who develop severe, laboratory-confirmed disease, with the WHO citing case-fatality ratios of 56 to 75 per cent in previous Indian outbreaks. In the present Gujarat data, 27 deaths among 41 confirmed cases produce a crude case-fatality proportion of about 65.9 per cent, although that figure may change as pending results arrive and surveillance detects milder infections.
That proportion should not be interpreted as the risk of death for every infected person because patients with mild or asymptomatic infections may never be tested or included in the confirmed-case count. The Centre’s community serosurveys are intended partly to establish whether infection is substantially more widespread than hospital-based figures indicate.
There is no approved vaccine, virus-specific antiviral medicine or curative drug for Chandipura infection. Treatment is supportive and may include intravenous fluids, fever management, anticonvulsants for seizures, measures to control swelling in the brain, respiratory support and intensive monitoring of blood pressure and organ function.
Early recognition and referral can materially improve the chance of survival because clinicians can stabilize the patient and treat neurological complications before irreversible injury develops. Delaying treatment while attempting to manage a rapidly worsening fever at home is particularly dangerous given the speed with which severe Chandipura encephalitis can progress.
Prevention depends largely on avoiding insect bites and reducing breeding or resting sites around homes. Insecticide-treated nets, repellents, full-sleeved clothing, screens, proper waste disposal, elimination of stagnant water and the repair of cracks in mud or poorly plastered walls can help reduce exposure.
The current outbreak follows India’s largest recorded Chandipura-associated acute encephalitis episode in two decades, reported in 2024. The WHO counted 245 acute encephalitis syndrome cases and 82 deaths across India during that episode, although only 64 infections were laboratory-confirmed as Chandipura virus, illustrating why suspected and confirmed figures must be reported separately.
The renewed outbreak underscores a broader public-health problem: rare vector-borne infections can remain poorly understood between epidemics, leaving major questions about reservoirs, transmission and effective medicines unanswered. Gujarat’s immediate priority is early detection and intensive clinical care, but the longer-term requirement is sustained surveillance, faster diagnostics and research into vaccines and antiviral treatments.