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Two strains of the new coronavirus are spreading around the world.
The team identified two types of the virus based on differences in the genome at these two regions: 72 were considered to be the “L-type” and 29 were classed “S-type”.
A separate analysis by the team suggests that the L-type was derived from the older S-type. The first strain is likely to have emerged around the time the virus jumped from animals to humans. The second emerged soon after that, says the team. Both are involved in the current global outbreak. The fact that the L-type is more prevalent suggests that it is “more aggressive” than the S-type, the team say.
Jones says we can expect more strains to emerge. Epidemiologists generally agree that, once a person is infected with the coronavirus, they are unlikely to be infected again –
unless the virus mutates to allow it to overcome the immune system’s defences.
This “selection pressure” could lead to the outbreak of a new strain, says Jones. This is the case with seasonal flu – new variants crop up every year that can infect people whether or not they’ve had flu in the past.
We could see the same pattern emerge for the new coronavirus in the coming years, says Jones. “I don’t see it going away any time soon.”
Read more:
https://www.newscientist.com/article/2236544-coronavirus-are-there-two-strains-and-is-one-more-deadly/#ixzz6Hpsngoxi