The worst of the U.S. flu season appears to be over.
The Centers for Disease Control and Prevention reported Thursday that the virus peaked in late February, and case reports have dropped steadily since then.
At the peak, more than 25 percent of possible flu specimens sent to a nationwide network of doctors and labs tested positive for the virus. That number has since fallen to about 20 percent.
The flu peaked much earlier in the previous two seasons -- posing a problem because the early peaks were compounded by shortages of flu vaccine and delays in its delivery. This year's flu season was milder.
Health officials say the vaccine cooked up to fight the flu this year was well-matched against the strains of virus that circulated most commonly.
Flu kills as many as 20-thousand Americans each year.
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