With a rising death toll (15) and the deaths of a nurse and a soldier in Kolkata, panic about Nipah virus is spreading in Kerala. Half-informed WhatsApp messages about Nipah are making it hard for people to distinguish fact from fiction, but what is known is that it is fatal in 70% of cases and there is no vaccine. On 29 May health experts flew to Kerala to help contain the virus that the WHO lists alongside Ebola and Zika as a disease that could cause a global epidemic. Emergency measures have been imposed to curb its spread; dozens of patients have been quarantined since the outbreak was detected two weeks ago. Nipah spreads from bats or pigs to humans, with many strains capable of spreading from person to person. This increases the chances of a strain emerging that spreads rapidly among the densely populated communities and beyond. See