India, Sept. 6 -- Hectic efforts are on to trace the source of Nipah infection in north Kerala's Kozhikode which claimed the life of a 12-year-old boy on Sunday even as more samples of quarantined people were sent to the National Institute of Virology (NIV) in Pune for tests.

Three people, including the boy's mother, were shifted to Nipah ward in Kozhikode medical college hospitals after they showed symptoms of the infection. Two of them are health workers. Twenty primary contacts and 158 secondary contacts of the deceased were quarantined soon after Nipah was confirmed. The boy's route map was also released. High alert has been sounded in two neighbouring districts of Kannur and Malappuram.

State health minister Veena George said on Mo...