The most aggressive strains of Sars-CoV-2 could generate 270 times as much viral load as the least potent type
New York may have a deadlier strain imported from Europe, compared to less deadly viruses elsewhere in the United States.
Coronavirus’s ability to mutate has been vastly underestimated, and mutations affect deadliness of strains, Chinese study finds | South China Morning Post
Full paper here:
Patient-derived mutations impact pathogenicity of SARS-CoV-2 | medRxiv
If they are right this will complicate vaccine development, drug therapies, results from clinical trials etc. Also might be why we are starting to see studies showing large numbers with antibodies but never had symptoms, they were exposed to a weaker strain.