Flu Babi -- Alert Menkes Ri!

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Commentary

1918 and 2009 H1N1 Similarities Confirm Recombination Recombinomics Commentary 14:41 July 13, 2009 The new Nature report also assessed the immune  response of different groups to the new virus. The most  intriguing finding, according to Kawaoka, is that those  people exposed to the 1918 virus, all of whom are now in  advanced old age, have antibodies that neutralize the  H1N1 virus. "The people who have high antibody titers  are the people born before 1918," he notes. The above comments are in association with an  upcoming publication in Nature demonstrating that  patients born prior to 1918 still have antibodies that not  only neutralize the 1918 pandemic virus, but also cross  react with the 2009 pandemic swine H1N1.  Similarly, the  2009 pandemic strain replicates more efficiently in the  lungs of experiment mice and ferrets, which may explain  the frequent deaths of previously healthy young adults.   The targeting of this age group also parallels data from  1918. These data further support the observation that the 90%  of the polymorphisms in sequences of all 8 gene  segments from the 1918 pandemic strain can be found in  a human H1N1 isolate, WSN/33 or a swine H1N1  isolate, A/swine/Iowa/15/1930.  These data support a  scenario that mimics the data for 2009, which involves a  swine H1N1 moving into a human population and  spreading efficiently. Data worldwide identify previously healthy young adults 

dying from the pandemic H1N1 infection.  However, as  the swine H1N1 spreads throughout the human  population, opportunities for adaption to human host  arise via acquisition of human polymorphisms.   Interestingly, many of the new acquisitions of can be  found in early H1H1 isolates, raising additional concerns  that the 2009 pandemic H1N1 is following a path similar  to the evolutionary path of 1918. A recent isolate from Japan, A/Sapporo/1/2009 has a  genetic HA backbone matching the recent oseltamilvir  resistant isolate A/Hong Kong/1269/2009, but has  acquired a new polymorphism found in WSN/33 as well  as an additional polymorphism found in  swine/Iowa/15/1930, further supporting evolution along  the 1918 pathway. Thus, the growing list of similarities between 2009  pandemic H1N1 and 1918 pandemic H1N1 continues to  cause concern. Media Links Recombinomics Presentations Recombinomics Publications Recombinomics Paper at Nature Precedings

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