The report supports U.S. health officials have said - that the H1N1 virus has decreased over large parts of the United States, after reaching a second peak in October.
"Children aged five to 14 are still the highest percentage of test results H1N1 positive versus negative results, with a large positivity rate to 40 percent. By comparison, nearly 80 percent of children in this age group were positive for the virus in late October, "Quest said in a statement.
The company analyzed 170,000 samples from flu taken between May and December to identify two peaks in the American epidemic - one in April and one in late October.
"Between this week and peak on December 9 trial price fell 75 percent. In the last week reported December 9 was considered equal to the volume recorded at the end of August, when the second wave has begun" , the company said.
Flu often goes in waves, with peaks in one season. H1N1 emerged in March, as flu is generally settlement in the northern hemisphere, and distributed globally throughout the summer.
So far, he has completely overshadowed the seasonal flu, which typically starts circulating in the United States in October and peaks in February.
Quest Dr. Jay Lieberman said that there could be several reasons for the drop tests positive for H1N1.
"These include a prior infection by millions of Americans with the H1N1 flu vaccines, which have reduced the number of susceptible patients, and changes in physician test ordering practices," the declaration bed.
DECLINE OF STRIKING
"The most dramatic decline in positive test results occurred in the area covered by the Pennsylvania, Maryland, Delaware, District of Columbia and Virginia and West Virginia, where the detection rate has decreased 87 per cent During the two weeks ending December 9 compared to the previous two - one week period. "
The results show that people get sick from a number of infections outside of the flu. Doctors usually only tests for influenza patients who are seriously ill or at risk of becoming seriously ill, and would therefore benefit from antiviral drugs like Tamiflu, Roche AG and GlaxoSmithKline's Relenza.
But only 44 percent of suspected cases of flu tested positive for H1N1 in November, and only 21 per cent of samples sent in December were positive for H1N1, Quest said.
U.S. health officials said this week that 100 million doses of H1N1 vaccine is now available or had been delivered, and urged everyone to be vaccinated. H1N1 could still top again, and can also mutate into a form more dangerous.
U. S. The Centers for Disease Control and Prevention estimates that 47 million Americans have been infected with H1N1, has killed nearly 10,000 have been killed by it and more than 200,000 hospitalized.
Even if the gravity seems a little sweeter than the seasonal flu, which kills about 36,000 people each year, most patients who die or have severe disease of swine flu are children or non-elderly adults.
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