Malda Medical College and Hospital is yet to begin the tests, sources in the health department said. Yet, Bengal lags behind all states in number of tests conducted — less than 50 tested per million — according to data from the National Institute of Epidemiology, Chennai. Several scientists and public health experts have said more tests are the need of the hour to identify asymptomatic carriers. Secondary contacts are contacts of primary contacts and tertiary contacts came in contact with secondary contacts. There are seven laboratories conducting tests in Bengal now.

Source: The Telegraph April 14, 2020 21:00 UTC