While the word 'mutation' can sound alarming, it's not unexpected for the COVID-19 coronavirus to evolve. The real concern lies in the nature of these changes. Recent analysis reveals two distinct strains, one more aggressive and transmissible than the other.
As of the evening of March 4, 2020, France reported 4 deaths and 285 confirmed cases, ranking sixth among the hardest-hit countries. Around the same time, reports from Iran suggested the virus might be causing myocarditis—inflammation of the heart muscle—indicating possible mutations.
Like all viruses, SARS-CoV-2 carries its genetic material in RNA rather than DNA. During replication, errors can occur, leading to mutations.
COVID-19 also shows a strong affinity for human cells. When it enters a new host with different immune traits, it can undergo subtle adaptations, replicating in a slightly altered form to better suit its environment.
A study published in National Science Review on March 3, 2020, by Chinese researchers identified two strains: the original S type, linked to early Wuhan cases, and the L type, which is more aggressive. The L strain, better adapted to humans, now accounts for 70% of cases, compared to 30% for S.
Public health measures have prevented the L strain from completely overtaking S, but both continue to circulate and infect new people. New, potentially more virulent strains could emerge, underscoring the ongoing risks.
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