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Influenza A/H1N1: 7 October
7 October 2009
The vaccines from the major manufactirers have now completed the initial studies, and all studies show that at least in young and healthy people, one dose provide a good and presumably protective immune response. The vaccine is so far distributed to governments and are not yet available on the market.

The CDC  report sligthly increasing numbers of confirmed H1N1 cases.  99% of all influenza virus typed is the new H1n1 and the previous seasonal H3N2 seems to have disappeared. CDC FluView.

The number of cases continue to decease after week 34, where the highest number of cases were recorded. The list of cases in each country can be found here: E-CDC

Autralia (and other countries on the southern hemisphene) experienced the first wave of the H1N1 in the June to september winter season. The overall attack rate in the population was about 7%, which is quite low.  

Seasonal influenza vaccine protect against H1N1
A new study from Mexico published the 6th October in the Britisk Medical Journal show, that vaccination with the vaccine against seasonal inflúenza show some protection against the H1N1 influenza. The seasonal influenza contain a H1N1 component, which could explain the partial protection. 

After the peak in the summer months in Europe and the pandemic in Australia, the activity is at the present low. N1H1 continue to circulate however, and most isolates are H1N1, which seems to have replaced the seasonal H3N2 influenza virus.