tested positive for Covid-19 following which their samples have been sent to the National Institute of Virology in Pune for genomic analysis.Kerala Health Minister K K Shailaja has said that samples of eight returnees were found positive for coronavirus and their samples have been sent to NIV for further tests.Following this development, it has been decided to subject the returnees to more tests, news agency PTI quoted her as saying.Surveillance at the four international airports in the state have been further strengthened.After the recently held local body polls, it was feared that there would be a massive surge in cases.However, that did not occur.The death rate did not go up in the state as the government had taken precautionary steps in.