A Chinese study in which researchers from the School of Life Sciences at Peking University and the Pasteur Institute in Shanghai found a "more fierce" strain of the Corona virus called "L" and another less fierce known as "S", which means that the virus developed itself once on The least recently, according to Sky News.
The study showed that 70 percent of the corona viruses are of the type "L", compared to 30 percent of the type "S", and researchers suggest that the "L" strain behind a mutation in the "ancestral copy", or the "S" strain, and "despite" Type L is the most prevalent (70 percent), so the S strain is the oldest version. "
The researchers believe that human intervention may have put a great selective pressure on type L, which may be more aggressive and spread more quickly.
On the other hand, the S type, which is progressively older and less aggressive, may have increased due to the relatively weak selective pressure. "
The researchers concluded that "these results strongly support the urgent need for more comprehensive, immediate studies combining genetic and epidemiological data and graph records of clinical symptoms of patients with Corona virus," noting that the data available for the study were "very limited."