… SARS-CoV-2 is an easily spreadable virus which would … due to countries effected by war
including Libya, Syria and Yemen… common variants of SARS-CoV-2 strains in these populations…

… observed between closely related viral strains isolated from various species, … SARS-CoV-2
like viruses to different hosts and the evolutionary patterns of the major clades of SARS-CoV…

… At the beginning of 2021, no single strain of SARS-CoV-2 was dominant, while several strains
… SARS-CoV-2 Delta strain began to spread and quickly displaced the previous strains. This …

… , and airplanes—we will continue to spread new strains of this virus around the globe. Many
people still imagine that they are at war with SARS-CoV-2, even as it proves ever able to …

… on a mutation of SARS-CoV-2 that is thought to be more transmissible than the original strain,
we … events affecting the health and well-being of humans worldwide since World War II. …

… In contrast, infection with a mutual seasonal human coronavirus strain does not convene
permanent defense against reinfection, while reinfection within six months is not common [64]. …

… The combination between variant strains might result in higher … Two variant strains combine
to form a new mutation with the … Only in the 20th century, the Spanish flu, the two World Wars, …

… strain, providing evidence of cross-immunity. Per incidence proxy unit, the effect of the
cross-immunizing strain was always less than the effect of the strain … anti-virus war, Beijing finally …

… B19 (B19V) in human remains dating from the Second World War in Russia 32 , the pandemic
1918 influenza A virus H1N1 strain from Alaskan permafrost 33 and HBV and smallpox in …