Researchers found the Covid-19 has three distinct strains - type A, B and C, that is spreading around the world after the original virus underwent an early mutation in China's Wuhan.Cambridge University researchers mapped the genetic history of the infection from December to March and found three distinct, but closely related, variants. While type A variant, the original virus that jumped to humans from bats via pangolins, was not widespread in China but it quickly spread in the UK, the US and Australia. While China, the pandemic's ground-zero, was mainly hit by type B, which was in circulation as far back as Christmas Eve.
The US which crossed over 400,000 Covid-19 cases, witnessed two-thirds of samples were type A, but infected patients mostly came from the West Coast, and not New York, reported Daily Mail.While the type B spread widely in the UK, with three quarters of samples testing as that strain, as well as Switzerland, Germany, France, Belgium and the Netherlands. Another distinct variation, type C, descended from type B and spread to Europe via Singapore.
Scientists believe the virus, officially called SARS-CoV-2, is constantly mutating to overcome immune system resistance in different populations.