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Re: Swine H1N1 Explosion in United States
The Qinghai strain is an easy call. Most who seriously study the evolution of infleunza viruses use phylogenetic analysis to trace origins. The Qinghai strain is clade 2.2 and it burst onto the scene at Qinghai Lake in May, 2005. The clade 2.2 subsequently spread to more than 50 countries west of China. None of these countries had previously reported Asian H5N1, and ALL isoaltes in poultry, wild birds, and humans were clade 2.2 (Qinghai strain).
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The outbreak at Qinhai Lake was massive and involved long range migratory birds, which then transported and transmitted the virus. The Qinghai strain, like the Fujian strain (clade 2.3) was a VERY easy call and the strain was named after the isolates from BIRDS. The first reported human cases involving Qinghai 2.2 were in Turkey. The H5N1 wasn't called the Turkey strain, it was called the Qinghai strain (or clade 2.2).
The swine H1N1 circling the globe originated in SWINE. All 8 gene segements had been seen in swine previously, but the most closely swine sequences were easily those identified in Alberta, Canada. However, it is likely that even closer sequences are in swine elesewhere, which is why no one is calling this the Mexican strain, other than those who don't understand its origins.
The swine elsewhere are most likely in the Americas, but there are NO public sequences linking the strain to Mexica swine.
Originally posted by gsgs
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The outbreak at Qinhai Lake was massive and involved long range migratory birds, which then transported and transmitted the virus. The Qinghai strain, like the Fujian strain (clade 2.3) was a VERY easy call and the strain was named after the isolates from BIRDS. The first reported human cases involving Qinghai 2.2 were in Turkey. The H5N1 wasn't called the Turkey strain, it was called the Qinghai strain (or clade 2.2).
The swine H1N1 circling the globe originated in SWINE. All 8 gene segements had been seen in swine previously, but the most closely swine sequences were easily those identified in Alberta, Canada. However, it is likely that even closer sequences are in swine elesewhere, which is why no one is calling this the Mexican strain, other than those who don't understand its origins.
The swine elsewhere are most likely in the Americas, but there are NO public sequences linking the strain to Mexica swine.
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