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Natural Immunity Against Avian Flu may Be Possible

A new research suggests that some people may become immune to avian flu. Richard Webby and colleagues at St. Jude Children's Research Hospital// investigated this possibility in mice and a small group of humans.

The H5N1 avian flu virus is quite different from the seasonal H1N1 and H3N2 flu viruses most humans have been exposed to, which is why many scientists believe that H5N1 could start a new pandemic. (The H and N refer to two virus components, the proteins hemagglutinin and neuraminidase, each of which exists in several varieties identified by a number following the letter.)

Webby and colleagues wondered whether immunity to the human type 1 neuraminidase (huN1) in H1N1 influenza virus strains (and vaccines made to protect against them) could provide protection against avian H5N1 influenza virus, which contains the closely related avian type 1 neuraminidase (avN1). In the new study, they group of humans.

The researchers immunized mice with DNA that caused their cells to make the neuraminidase from an H1N1 virus found in human outbreaks. They then examined the immune response of the mice to this huN1 and to avN1 from an avian H5N1 virus isolated from a human patient (A/Vietnam/1203/04).

Most of the mice responded to the DNA vaccine by making antibodies that recognized huN1; a few also made antibodies against avN1. (Antibodies are proteins circulating in the body that recognize and stick to some specific part of a foreign agent such as a virus.) All the vaccinated mice survived infection with a man-made flu virus containing huN1, and half also survived infection with low doses of A/Vietnam/1203/04 or of a man-made virus containing avN1.

The researchers then tested blood samples from 38 human volunteers for their ability to inactivate neuraminidase from an H1N1 virus and two H5N1 viruses. Most of the samples were active against the protein from the H1N1 virus; and 8 or 9 also inhibited the protein from both
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