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Source: ONE News -
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Results of tens of thousands of flu tests indicate that the
pandemic H1N1 virus is spreading from school-aged children to the
rest of the US population, makers of the tests say.
Quest Diagnostics, which makes a commercially available test that
can confirm swine flu infection, said the findings suggest many
more adults will be infected with the new H1N1 influenza.
"Based on tests performed since Quest Diagnostics began offering
H1N1 testing in May 2009, children between the ages of five to 14
have experienced higher overall rates of H1N1 positivity than any
other age group," the company said in its report.
The Quest test is a PCR test - it magnifies the genetic material of
the virus so it can be detected and is similar to the tests used by
state health departments to confirm H1N1.
On-the-spot flu tests given in doctor's offices only tell if a
person has influenza A or not.
They cannot tell which strain, and they often miss the new H1N1
strain completely.
The US Centers for Disease Control and Prevention has given up
trying to count how many people have the new H1N1, saying only that
is it well over a million. Only select cases are tested.
The CDC reported that data from 27 US states shows 53% of people
sick enough to be hospitalized with H1N1 flu are under the age of
25, with only seven percent of hospitalizations among people 65 and
older - a reversal of the trend seen with seasonal flu.
Dr Jay Lieberman, medical director for Quest Diagnostics and a
paediatrician at the University of California, Irvine, says data
from Quest's testing, based on 76,500 specimens taken between May
11 and October 11, 2009, can supplement the CDC's findings, which
cover fewer than 5,000 patients.
Sharp rise
The sharp rise in cases in children came at the end of August and
beginning of September, Lieberman said.
"What is interesting is that we are now seeing delayed by several
weeks a rise in other age groups - in the elderly, in people aged
50 to 64 and in children under-5 years of age," Lieberman
said.
Influenza often spreads from school-aged children to siblings,
parents and eventually grandparents.
"What we have seen in the pandemic so far is that the elderly have
been relatively spared. That may start to change in the weeks
ahead," Lieberman said.
Many scientists think the elderly are less likely to be infected
because they have some immunity to the H1N1 virus.
Lieberman said the findings show it is important to vaccinate
children against influenza to slow the spread in the
community.
Cases are evenly divided by gender, Quest said, and about half of
all samples sent for testing - by doctor's offices, state and
county health departments - turn out to be H1N1.
H1N1 has been mild to moderate so far.
Lieberman said had it been a more pathogenic virus, causing severe disease in more people, officials likely would have closed schools to help slow its spread until more vaccines could have become available.
