Union Health Minister Harsh Vardhan has asked four northeastern states – Tripura, Manipur, Meghalaya and Mizoram – to increase testing on high risk groups and vulnerable population to check the spread of Covid-19, officials said on Thursday.

According to the officials, Harsh Vardhan, during a meeting via video conferencing with seven states, including the four northeastern states, said that active cases are on the rise in Manipur and higher positivity in the state is indicative of hidden transmission.