The World Health Organization (WHO) this week fleshed out details on Nipah virus infections in Bangladesh that first surfaced in media reports in late January.
The two cases were confirmed before February 9, and both patients died from their infections. Both are from Dhaka division but are from separate districts and aren't epidemiologically linked to each other, the WHO said in a statement.
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Man had consumed raw date palm sap
The first patient is a 38-year-old man whose symptoms began on January 11. He was admitted to a local hospital on January 16, then transferred to a facility in Dhaka city when his condition worsened. The man died on January 28 about a week after his blood and respiratory samples tested positive for Nipah virus.
An investigation revealed the man had consumed raw date palm sap on December 31, a practice known to increase the risk of contracting the disease. No other Nipah cases were detected in 91 of the man's contacts. Infections in Bangladesh typically track with harvest of date palm sap, which occurs from December through May. Public health officials continue to warn against drinking raw date palm sap because it can be contaminated with bat droppings that contain the virus.
Girl regularly drank raw date palm sap
The second patient is a 3-year-old girl who was isolated in a Dhaka city hospital on January 30, about 2 days after her symptoms began. On the following day her Nipah virus infection was confirmed and she died.
Investigators found that the girl had regularly consumed raw date palm sap. All 67 of the girl's contacts tested negative for the virus.
The WHO said the risk to Bangladesh is moderate, partly due to the high case-fatality rate and because people continue to drink raw date palm sap, despite ongoing efforts to teach communities about the risk. It added that the regional risk is moderate because Bangladesh shares an ecological corridor with India and Myanmar for the bats that are the natural Nipah virus hosts.
There are no vaccines or treatments for Nipah virus, which has been classified as a priority disease for countermeasure research and development.