Delta/ δ） The strain is one of the most important virus variants in the world COVID-19. From the previous related epidemic situation, the delta strain has the characteristics of strong transmission ability, fast transmission speed and increased viral load.
1. Strong transmission capacity: the infectivity and transmission capacity of delta strain have been significantly enhanced, which has doubled the transmission capacity of previous strains and more than 40% higher than that of alpha strain found in the UK.
2. Fast transmission speed: the incubation period and passage interval of delta strain are shortened after infection. If the prevention and control measures are not in place and the vaccine is not vaccinated to form an immune barrier, the doubling speed of epidemic development will be very significant. It is equivalent to that in the past, the number of patients infected with delta strain will increase by 2-3 times every 4-6 days, while there will be 6-7 times of patients infected with delta strain in about 3 days.
3. Increase of viral load: the results of virus detection by PCR show that the viral load in patients has increased significantly, which means that the proportion of patients turning to severe and dangerous is higher than before, the time of turning to severe and dangerous is earlier, and the time required for nucleic acid negative treatment will be prolonged.
Although the delta strain may have immune escape, and some will avoid neutralizing antibodies to inhibit the immune response, the proportion of people who have not been vaccinated in the confirmed cases who have become severe or severe is significantly higher than those vaccinated, indicating that it is produced in China
Post time: Nov-17-2021