Patna: Experts Wednesday collected samples of litchi to identify the virus strain that has claimed the lives of over 50 children in Bihar.

"We have collected samples of litchi from orchards in affected areas for toxicology study. It will help us to identify the virus strain of the disease that remains a mystery till date," said Prabhat Kumar Sinha, who is heading a six-member team from the Rajendra Memorial Research Institute of Medical Sciences (RMRIMS).