Chandipura virus infection is rare but can cause severe illness, especially in children. It may initially appear like a routine fever, but symptoms can worsen rapidly as the infection can affect the brain. If a child develops a sudden high fever along with repeated vomiting, unusual sleepiness, confusion, seizures, or loss of consciousness, seek emergency medical attention without delay.
Chandipura virus (CHPV) has caused outbreaks of Acute Encephalitis Syndrome (AES) in the past. It is especially affecting children below 15 years of age in India. It has been in focus again in 2026. The Ministry of Health and Family Welfare deployed a National Joint Outbreak Response Team to Gujarat and Rajasthan on 5 August in response to ongoing CHPV outbreaks.
Consequently, it is important to understand the symptoms, transmission, treatment, and prevention of the Chandipura virus, especially for parents living in outbreak-affected regions of India.
Chandipura Virus at a Glance
| Factor | Key Information |
|---|---|
| Virus | Chandipura virus (CHPV) |
| Virus family | Rhabdoviridae |
| Main disease associated with CHPV | Acute febrile illness and acute encephalitis syndrome |
| Most affected age group | Children below 15 years |
| Primary known vector | Sandflies |
| Incubation period | Usually 24 – 48 hours to 5–6 days |
| Common early symptoms | High fever, headache, body aches, fatigue, nausea, and vomiting |
| Serious symptoms | Seizures, altered consciousness, weakness, paralysis, and coma |
| Specific antiviral medicine available? | No |
| Vaccine available? | No |
| Main prevention strategy | Vector control and protection from insect bites |
The National Centre for Disease Control’s Chandipura Virus CD Alert describes these characteristics.
What is the Chandipura Virus?
Chandipura virus is an RNA virus belonging to the Rhabdoviridae family and the Vesiculovirus genus. The virus gets its name from Chandipura village in Maharashtra. Researchers first isolated it there in 1965 from the blood of adults with febrile illness.
For several years, the virus attracted relatively little attention. This changed after outbreaks of severe encephalitis occurred among children in India.
The virus became particularly important after the 2003 outbreak in Andhra Pradesh. A study published in The Lancet investigated an outbreak involving 329 cases of acute encephalitis and 183 deaths among children. This translated into a case-fatality rate of about 55.6%. Researchers identified the Chandipura virus in clinical samples from affected patients. Read the study on PubMed.
Chandipura virus has since been associated with outbreaks in states including Maharashtra, Gujarat, Andhra Pradesh, and other parts of India. Cases have often been reported around the monsoon and post-monsoon periods, when environmental conditions can support greater vector activity.
The major concern is not that every infection becomes severe. In fact, evidence suggests that mild, even subclinical, infections can occur. The concern is that when neurological disease develops, deterioration can sometimes be very fast.
What Causes Chandipura Virus Infection?
Chandipura virus (CHPV) infection is caused by the Chandipura virus, a virus belonging to the Rhabdoviridae family. It is primarily transmitted through the bite of infected sandflies, although mosquitoes and ticks can also act as vectors.
The infection is considered vector-borne. This means an arthropod can carry the virus and transmit it to a person through a bite.
Sandflies are the main established vectors
Sandflies have the strongest evidence as vectors of the Chandipura virus. The NCDC identifies species in the genera Phlebotomus and Sergentomyia as important vectors. Phlebotomus papatasi has been particularly associated with transmission in Gujarat.
Sandflies are very small blood-feeding insects. Females need blood meals to produce eggs. They commonly rest and breed in dark, damp, humid environments, including:
- Cracks and crevices in walls and floors
- Cattle sheds and animal shelters
- Rodent burrows
- Moist soil
- Organic debris
- Dense vegetation
- Tree holes and similar sheltered locations
Sandflies tend to become more active around dawn and dusk. Their density can also rise during warm, humid weather and around the monsoon and post-monsoon periods.
Can mosquitoes or ticks spread the Chandipura virus?
The answer requires some nuance.
The WHO has previously listed sandflies, mosquitoes, and ticks as possible vectors. However, researchers are still investigating the role of different arthropods.
In its August 2026 update, the Ministry of Health and Family Welfare described sandflies as established vectors. At the same time, researchers are studying whether mosquitoes, ticks, mites, and other arthropods contribute to transmission. Officials have specifically cautioned against identifying the vector responsible for the current 2026 outbreak before investigations are complete.
The NCDC also notes that mosquitoes can transmit CHPV under laboratory conditions, but historically, the virus has not been confirmed as isolated from wild mosquito vectors.
Does the Chandipura virus spread from person to person?
Currently, there is no evidence of human-to-human transmission of the Chandipura virus. This means the infection is not known to spread through ordinary contact with an infected person, as with influenza or COVID-19.
Scientists are still studying the virus’s complete transmission cycle, including the possible role of animals and different arthropod species.
What is the Incubation Period of the Chandipura Virus?
The incubation period is the time between exposure to an infection and the appearance of symptoms.
According to the NCDC, the incubation period of the Chandipura virus is typically short, ranging from 24- 48 hours to 5–6 days.
This short timeline is one reason parents and caregivers should not ignore sudden neurological symptoms during outbreaks.
Chandipura Virus Symptoms You Should Know
The severity of Chandipura virus symptoms can vary considerably. Some infections may produce mild symptoms. Others may progress to acute encephalitis or encephalopathy.
Early Chandipura Virus symptoms
Initial symptoms can resemble those of many common viral illnesses. They may include:
- Sudden high fever
- Headache
- Muscle pain or body aches
- Fatigue
- General weakness or malaise
- Nausea
- Vomiting
- Diarrhoea in some cases
The NCDC clinical guidance notes that fever can be high and may exceed 39°C (102.2°F).
Neurological symptoms
The condition becomes more concerning when the virus affects neurological function.
Symptoms may include:
- Irritability
- Unusual drowsiness
- Confusion or disorientation
- Abnormal behaviour
- Seizures or convulsions
- Weakness in the arms, legs, or facial muscles
- Paralysis
- Stiff neck
- Reduced consciousness
- Coma
These symptoms can indicate acute encephalitis syndrome and require urgent hospital evaluation.
How do symptoms progress in children?
The NCDC describes two broad clinical phases in affected children.
- The prodromal phase can last around one to three days. During this stage, children may have fever, headache, muscle pain, and general malaise.
- The encephalitic phase is much more serious. Fever may persist while neurological symptoms develop. The child may experience seizures, abnormal movements, decreasing consciousness, or focal neurological problems.
Importantly, not every child follows the same pattern.
When Do Chandipura Virus Symptoms Become an Emergency?
Chandipura-associated AES is considered a medical and neurological emergency.
Seek immediate medical attention when a child with fever develops any of the following:
- A seizure
- Unusual sleepiness or lethargy
- Confusion
- Abnormal behaviour
- Loss of consciousness
- Weakness or paralysis
- Refusal to eat or drink
- Reduced urine output
- Breathing difficulty
- Signs of shock
- Repeated vomiting with neurological changes
Parents should not wait for the fever to settle on its own when neurological symptoms appear.
WHO reports that severe CHPV disease can progress rapidly and that deaths in children have occurred within 48–72 hours after symptom onset. Previous outbreaks have reported case-fatality ratios ranging from about 56% to 75%, although mortality varies considerably between outbreaks and patient groups.
These historical figures should not be interpreted to mean that every infected child has the same risk. Mild and asymptomatic infections have also been documented. Early detection and intensive supportive care can improve survival.
Why Does the Chandipura Virus Mainly Affect Children?
One of the most striking features of Chandipura virus disease is its association with children younger than 15 years.
Scientists do not yet have a single, complete explanation for this pattern.
NCDC data indicate that susceptibility may be age-dependent. Earlier studies found lower evidence of previous exposure to CHPV among children than among adults. Adults in affected areas may have been exposed previously and may therefore carry neutralising antibodies.
This is different from simply saying that children develop the disease because they have “weak immunity.” The relationship between age, previous exposure, immune response, and severe neurological disease is more complex.
Research is continuing. A 2026 genomic study notes that the viral and host factors responsible for rapid neurological disease in children remain incompletely understood. The study was published in Microbiology Spectrum.
How Serious Have Chandipura Virus Outbreaks Been in India?
India has had many CHPV outbreaks, but analysing them requires careful attention. Some of the numbers include all CHPV-related AES cases. Others include CHPV-related AES, but are confirmed cases.
The 2003 outbreak
In Andhra Pradesh, 329 children with acute encephalitis were reported, and 183 died during the 2003 outbreak investigated by researchers. That equalled a case-fatality rate of approximately 55.6%.
The 2024 outbreak
From June to August 2024, the WHO noted 245 AES cases and 82 deaths in India, generating an AES case-fatality rate of 33% for this period. For these cases, 64 were confirmed as Chandipura virus infections. The WHO documented this as India’s largest CHPV outbreak in twenty years.
The NCDC later noted that through 31 August 2024, Gujarat and Rajasthan together reported 250 AES cases, of which 66 were confirmed as CHPV. 82 deaths were reported among the AES cases, and 29 deaths were reported among the laboratory-confirmed CHPV cases.
A 2026 genomic study of the outbreak in Gujarat found that of the 328 suspected pediatric AES cases evaluated, 61 tested positive for CHPV, yielding a test positivity rate of 18.59% in this population. A case fatality rate of approximately 46% was documented, as 28 deaths were reported among the documented CHPV cases.
These figures are based on different locations, dates, surveillance systems, and denominators. Therefore, they should not be compared directly as if they represent the exact same patient population.
What is happening in 2026?
On 5 August 2026, the Union Health Ministry confirmed the ongoing CHPV outbreak in Gujarat and Rajasthan and deployed a National Joint Outbreak Response Team. The response has included the NCDC, ICMR, and the Department of Animal Husbandry and Dairying.
Human and animal surveillance is ongoing, along with serological studies and genomic sequencing. As per the Ministry, India’s hospital-based AES surveillance network currently includes 15 tertiary care hospitals.
How is the Chandipura Virus Diagnosed?
Symptoms alone cannot confirm Chandipura virus infection. Fever, vomiting, seizures, and altered consciousness can occur with several other infections and neurological conditions.
Doctors first assess whether the patient meets the clinical criteria for acute encephalitis syndrome.
A suspected CHPV-AES case in a child generally involves abrupt fever, sometimes accompanied by vomiting or diarrhoea, together with new seizures or a significant change in mental state.
Laboratory tests for Chandipura Virus
A diagnosis may be confirmed using specialised laboratory testing such as:
- RT-PCR, which detects Chandipura viral RNA
- IgM ELISA, which detects antibodies against CHPV in blood or cerebrospinal fluid
- Testing acute and convalescent samples for seroconversion
- Virus isolation in specialised laboratories
WHO reported that laboratory-confirmed cases during the 2024 outbreak were identified using RT-PCR or IgM ELISA.
Other investigations may also be required
Because doctors must distinguish CHPV from other causes of encephalitis, investigations may include:
- Cerebrospinal fluid examination
- Blood glucose testing
- Complete blood count
- Liver function tests
- Kidney function tests
- Electrolyte assessment
- Coagulation tests
- Malaria testing when relevant
- Brain imaging, such as CT or MRI, when clinically required
The exact tests depend on the child’s symptoms and clinical condition.
Other causes of AES can include Japanese encephalitis, herpes simplex virus infection, dengue, malaria, rickettsial infections, and several other infectious and non-infectious conditions. This is why medical evaluation is essential.
What is the Treatment for Chandipura Virus?
There is currently no approved antiviral medicine that specifically cures Chandipura virus infection. There is also no approved vaccine against CHPV.
Treatment therefore focuses on keeping the patient stable while the body fights the infection and preventing complications.
1. Early hospitalisation and stabilisation
A child suspected of having AES should be rapidly evaluated and referred to an appropriate hospital.
Doctors assess breathing, circulation, consciousness, blood glucose, and neurological status. Early stabilisation can be critical because severe disease may progress quickly.
2. Airway and breathing support
Patients may require oxygen if oxygen levels fall. Children who cannot protect their airway or breathe adequately may require assisted ventilation in intensive care.
3. Blood glucose management
Blood sugar needs to be monitored because hypoglycaemia can worsen neurological injury. Doctors correct low blood glucose when it occurs.
4. Seizure management
Seizures require prompt medical treatment. Anticonvulsant medicines may be given under medical supervision. Continuous or repeated seizures may require intensive monitoring.
5. Managing raised pressure inside the brain
Severe encephalitis may lead to increased intracranial pressure. Doctors monitor neurological signs and use appropriate intensive-care measures when raised pressure is suspected.
6. Fluids and shock management
Children with dehydration, poor circulation, or shock may require carefully monitored intravenous fluids and other supportive treatment.
Because excessive fluids can also be harmful in certain neurological conditions, fluid therapy must be managed by trained medical professionals.
7. Treatment for other possible infections
Before the exact cause of AES is known, doctors may investigate and, where appropriate, treat other potentially serious causes such as herpes encephalitis, bacterial infection, malaria, or rickettsial disease.
These medicines are not treatments for the Chandipura virus itself. They may be used because delaying treatment for another serious infection while waiting for laboratory results could be dangerous.
Can Someone Recover Completely from the Chandipura Virus?
Recovery depends on the severity of infection and the extent of neurological involvement.
Some patients can recover completely. Others who survive severe encephalitis may experience neurological problems after the acute illness. Reported complications include cognitive difficulties, weakness or paresis, involuntary movements, and recurrent seizures.
Follow-up with paediatricians and neurological specialists may therefore be necessary after severe disease.
How to Prevent Chandipura Virus Infection
With no approved vaccine or virus-specific medication available, prevention mainly focuses on avoiding vector bites and reducing sandfly populations.
1. Wear clothes that cover exposed skin
Children should wear full-sleeved tops and full-length trousers, particularly in areas where CHPV activity has been reported.
Covering the skin reduces the area available for insect bites.
2. Use an appropriate insect repellent
The NCDC recommends using insect repellents containing DEET for personal protection when appropriate. Products should always be used according to their label instructions, particularly when being applied to children.
3. Reduce exposure around dawn and dusk
Sandflies are particularly active around dawn and dusk. Extra protection during these periods may help reduce exposure.
4. Repair cracks and crevices around the home
Sandflies can rest in cracks in walls, floors, roofs, and other dark spaces.
Sealing cracks and crevices and using fine mesh screens on windows and doors can make homes less favourable for sandflies.
5. Remove organic debris
Keep areas around homes clean. Remove decaying leaves and other organic waste that can help create moist resting or breeding environments.
Regular sanitation is particularly important around animal shelters.
6. Keep cattle sheds and animal shelters clean
Cattle sheds can provide dark and humid environments suitable for sandflies.
Proper waste disposal, regular cleaning, and environmental management can help reduce vector breeding and resting sites.
7. Manage dense vegetation near homes
Thick vegetation can create shaded, humid resting sites. Trimming dense vegetation immediately around homes and animal shelters may form part of environmental vector control.
8. Sleep above floor level where possible
NCDC guidance notes that sleeping on a bed or cot can help reduce contact with sandflies compared with sleeping directly on the floor.
9. Support public-health vector control
During outbreaks, health authorities may use indoor residual spraying and other insect-control measures in affected locations. Such spraying should be carried out in accordance with public-health protocols.
Households should not attempt to prepare or mix concentrated insecticides themselves.
Can Diet, Vitamins, or Supplements Prevent the Chandipura Virus?
No food, vitamin, herb, or nutritional supplement has been shown to specifically prevent or cure Chandipura virus infection.
A balanced diet that provides adequate protein, vitamins, minerals, fluids, and energy is important for general health. However, nutritional support is not a substitute for vector control or medical treatment.
During an outbreak, the most useful steps remain protecting children from insect bites, keeping surroundings clean, recognising warning signs, and seeking medical care quickly. WHO similarly identifies vector control, bite protection, early access to care, and supportive treatment as the key approaches currently available.
Conclusion
Chandipura virus is uncommon, but its ability to cause rapidly progressing neurological illness makes awareness important. Children below 15 years remain the main group affected during reported outbreaks.
The infection often begins with symptoms that resemble an ordinary viral fever. The warning signs are what follow. Seizures, confusion, abnormal drowsiness, behavioural changes, weakness, or loss of consciousness after fever require urgent medical attention.
There is currently no specific antiviral treatment or approved vaccine. However, early hospital care and supportive treatment can improve outcomes. Prevention depends largely on reducing exposure to sandflies and other vectors through protective clothing, appropriate repellents, environmental hygiene, cleaner animal shelters, home maintenance, and public-health vector-control measures.
Most importantly, awareness should lead to timely action rather than panic. Recognising symptoms early and reaching a medical facility quickly can make a crucial difference.
