銆€銆€ At the WHO routine press conference for new coronary pneumonia on April 16, 2021, Maria Van Kokhoff, the technical director of the WHO health emergency project, stated that the "double mutant" virus found in India carries the E484Q and L452R mutations. This characteristic makes the delta mutant strain have the characteristics of strong transmission, short incubation period, high viral load, rapid disease development, high proportion of severe illness, and possible immune escape phenomenon. The US "Nature" magazine quoted a study from China on July 27, saying that "the concentration of virus particles in a person infected with Delta virus is about 1,000 times that of the original strain of the new crown virus."
（its nightlife culture has taken a hit.illustrating an accelerating rate of fatalities.
還Moderna has committed to delivering 10 million doses by the end of March and 35 million each in the second and third quarter.
國(guo)5 Georgia runoff elections to determine control of the U.
個Reporting by Trevor Hunnicutt; Writing by Michael MartinaOur Standards: The Thomson Reuters Trust Principles.
France has been requiring people who enter France from Britain to prove they dont have COVID-19.