New Delhi, Feb. 28 -- Researchers from India's consortium mapping the genetic changes in Sar-Cov-2 virus have found the E484K mutation, found in the variants linked to Brazil and South Africa, in less than 10% of samples from Maharashtra, leading them to believe that the resurgence in the state may not be due to this factor.

The E484K mutation, which occurs on the spike protein used by the virus to enter human cells, is thought to cause loss of sensitivity to immune response generated by current vaccines or previous infections. This, in effect, means the current vaccines approved world over may not work well against the mutation and there is a chance of re-infection.

The mutation is present in both the South African B.1.351 variant and Br...