Cases of West Nile fever have been reported in three districts of Kerala state. Notably, the West Nile Fever has been reported in Malappuram, Kozhikode and Thrissur districts. A total of five cases were reported in Kozhikode district of which four have recovered, and one is currently under treatment in the government medical college hospital. The West Nile fever is spread by the Culex species of mosquitoes. The main symptoms of West Nile infection are headache, fever, muscle aches, dizziness and loss of memory. The fever was first detected in Kerala in 2011 and a six-year-old boy from Malappuram died due to the fever in 2019.

Source:

https://www.deccanherald.com/india/kerala/west-nile-fever-in-kerala-state-govt-orders-all-districts-to-be-vigilant-3012031

https://www.hindustantimes.com/india-news/kerala-reports-10-cases-of-west-nile-virus-all-you-need-to-know-101715078365305.html