The coronavirus mutated and became more contagious.
This was claimed by American researchers, Gadin.Net reports citing publika.az.
Comparing 5,000 samples of the virus that spread in two separate periods in Houston, scientists concluded that the infection was later more contagious. It has been reported that the number of "thorns" used by the virus to attach to human cells has increased.
No change was found in the direction of the virus's lethality.
The study is the first in terms of analyzing the structure of the coronavirus during two different waves, which spread in a large city.
Houston has a population of 7 million.