amid an unsettling report in the present day of tamiflu resistance inside a danish a(h1n1) individual,
Office Professional Plus 2010, comes a examine with the new england journal of medicine tracing the swine flu's 90-year evolution.
the current flu strain has genetic roots in an sickness that sickened pigs at a swine indicate in 1918 in cedar rapids, iowa. a near-century of improvement considering then may perhaps contain this flu's accidental resurrection from an extinct strain.
here's what probably went down. at the same time the 1918 flu pandemic was spreading among people, pigs have been hit which has a related respiratory illness. early experiments confirmed the 1918 swine virus plus a human strain emerged regarding the same exact time.
in accordance with the authors of the new paper,
Office 2007 Standard Key, there was a temporary "extinction" of this strain of virus from people in 1957. but then it reemerged 20 years later inside a small 230-person outbreak in 1976 among soldiers in fort dix, new jersey. that outbreak did not extend beyond the military base.
however the next yr h1n1 reemerged in people in the soviet union,
Windows 7 Enterprise, hong kong, and northeastern china. the genetic origin of that 1977 strain turns out not to be the 1976 fort dix strain. instead, it was closely related to a 1950 human strain.
which means that given the genetic similarity for the two strains,
Microsoft Office Home And Student 2010, reemergence was likely due to an accidental release during laboratory studies of your 1950 strain that had been preserved as a "freezer" virus.
ouch. hate it when that happens.
the authors hypothesize that concerns in regards to the fort dix outbreak stimulated a flurry of research on h1n1 viruses in 1976,
Windows 7 Professional Product Key, which led to an accidental release and reemergence from the previously extinct virus a yr later. the reemerged 1977 h1n1 strain has been circulating in various seasonal influenzas ever since—including today's.
or maybe it wasn't such an accidental a release? conspiracists, restart your engines.