Zhong Nanshan, an academician of the Chinese Academy of Engineering, said in an interview with reporters on the 25th that the Guangzhou epidemic is my country’s first response to the community transmission caused by the mutated strain of the new crown virus, Delta, which was first discovered in India. Phased results have been achieved, but other regions also need to advance. Take precautions. Judging from this epidemic, the Delta strain is highly contagious, and the establishment of an immune barrier is imminent.
①What is the delta strain? The Delta variant was named in May 2021, the new coronavirus variant strain B.1.617.2 discovered in India by the WHO. This variant was identified as one of the driving factors for the second wave of the epidemic in India. In early 2021, the epidemic raged in parts of India. Later, the “Delta” variant was further mutated to derive the “Delta plus” (Delta +) or “AY.1” variant. Initial data indicated that the Delta+ variant showed signs of resistance to monoclonal “antibody cocktail therapy”. The Central Drug Standards Control Agency (CDSCO) of India has approved the use of “antibody cocktail therapy” to treat new coronary pneumonia. On June 21, 2021, Maria Van Kokhoff, technical director of WHO’s health emergency project, said that the first variant of the new coronavirus strain “Delta” discovered in India has spread to 92 countries around the world. ②Which aspects will the fast spreading speed show? The characteristic of “Delta” mutant strains spreading fast, in fact, mainly refers to the time from effective exposure and infection to the appearance of clinical symptoms and the speed of onset. The time of onset has become shorter, or it can be said that between each generation, intergenerational Compared with past epidemic strains, the spreading interval has shortened the average incubation period by one or two days, and the speed is correspondingly faster. Finally, the BBC integrated data from Imperial College, The Lancet, etc., and compared the basic infection number of the new crown mutant strain with some other viruses, which is R0. The R0 of the “Alpha” mutant strain is 4-5, which means that without any intervention in epidemic prevention measures, a patient infected with the “Alpha” mutant strain can continue to transmit the virus to 4-5 people on average. . The R0 of Delta is 5-8, which is about 1.6 times that of Alpha. That is to say, the comparison between the two is approximately equal to the comparison below.