A UK infectious diseases expert stated that the Nipah virus, recently identified in India, is not likely to have a significant global spread risk. Professor Paul Hunter from the University of East Anglia emphasized the challenge of detecting Nipah at borders due to the delayed onset of symptoms after virus exposure.
Indian authorities have contained a Nipah outbreak in West Bengal after confirming two cases. Several Asian nations have heightened health screenings and airport surveillance for travelers arriving from India. All contacts of the infected individuals in India have been isolated and tested as per the Indian government’s guidance.
While Nipah is a severe infection, the risk of person-to-person transmission is low, with an R0 value below 1.0, according to Prof Hunter. However, vigilance is crucial as some viruses can mutate for increased infectivity, and the extended incubation period complicates border detection.
Nipah, known for its high fatality rate, has been previously reported in various Asian regions. The UK Health Security Agency (UKHSA) recommends awareness for travelers to affected areas, highlighting the absence of cases in the UK. The virus can spread from animals to humans and through contaminated food or direct human contact.
First identified in 1999 during a Malaysian and Singaporean outbreak among pig farmers, Nipah is associated with fruit bats that facilitate its circulation. Symptoms typically manifest within four to 21 days post-infection, starting with flu-like symptoms and potentially progressing to pneumonia.
Encephalitis or meningitis, occurring three to 21 days after infection, are severe complications of Nipah, with mortality rates ranging from 40% to 75%. Survivors may endure lasting disabilities like seizures and personality changes. Countries with previous Nipah outbreaks include India, Bangladesh, Malaysia, the Philippines, and Singapore.
The UKHSA notes that fruit consumption or fruit product ingestion often leads to infections, as they may be contaminated by infected fruit bats’ excretions. Person-to-person transmission through close contact or body fluids has been documented in Bangladesh and India. Presently, there is no established treatment or licensed vaccine for Nipah, necessitating ongoing research efforts.
