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Swine
flu Reports Swine
flu more dangerous for young adults with strong immune systems Washington:
Scientists are suggesting that the swine flu virus may be more dangerous for healthy
young adults because it likely kills its victims by inducing a "cytokine storm",
in which a patient's hyper-activated immune system causes potentially fatal damage
to the lungs. Cytokines are signalling chemicals that help mobilize immune cells
capable of removing infectious agents from the body. Research studies and review
articles published in the journal Viral Immunology reveal that a cytokine storm
occurs when the body's immune system over-reacts to an intruder, such as a virus,
by producing high levels of cytokines. The reports further suggest that too much
production of cytokines can stimulate an inflammatory response in which the accumulation
of immune cells and fluid at the site of infection may prevent affected organs,
such as the lung, from functioning properly, and may even cause death. The researchers
behind these articles say that the swine flu contains genetic components of the
H5N1 avian influenza virus, which tend to cause an unusually high proportion of
deaths among healthy young adults, most likely due to the overproduction of cytokines.
Dr. David L. Woodland, Editor-in Chief of Viral Immunology, emphasizes that much
is still not known about the current influenza outbreak and the human/avian combination
virus causing it. "We do not know how long ago this virus emerged, how deadly
it is, whether it has pandemic potential, how the severity of infection relates
to patient age, and why some infected patients die-whether a cytokine storm is
responsible for these deaths," he says. He further says what scientists know is
that some H1N1 viruses have pandemic potential, and that historical evidence supports
the possibility that young healthy adults may be especially susceptible to more
severe infection and poor outcomes due to the ability of a strong immune system
to initiate a cytokine storm. -May
6, 2009 Go
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