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Ani to:
"Anne Schuchat, head of science and public health at the CDC, said that
the US virus is an unusually mongrelised mix of genetic sequences from
North American pigs, Eurasian pigs, birds and humans. The H protein on
its surface, having hitherto circulated only in pigs, is one most human
immune systems have never seen, the crucial requirement for a pandemic
flu.

The virus's severity will depend on how many people who catch it die.
While suspect deaths in Mexico are being tested for H1N1, is not yet
known how many mild cases of virus there may have been in the affected
region that have gone untested. Both numbers are needed to calculate how
deadly a case might be. One ominous sign, however, is that the Mexican
cases are said to be mainly young adults, a hallmark of pandemic flu.

It can transmit among people. Those infected in the US had no known
contact with pigs, and the three separate clusters of cases did not
contact each other. This suggests, said Besser, that "this virus has
already been transmitted from person to person, for several cycles",
making it too late for emergency antiviral drugs to contain its spread
to a limited area.

'Because there are human cases associated with an animal influenza
virus, and because of the geographical spread of multiple community
outbreaks, plus the somewhat unusual age groups affected, these events
are of high concern," the WHO said."

Saulo