With increasing time since diagnosis, only the severe infections continued to cause symptoms.
The loss of activity is equivalent to 15% of the US population becoming completely immobile for 1 day.
Adult COVID-19 patients also infected with the flu are 4 times more likely to need mechanical ventilation and 2.4 times more likely to die.
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With the flu season hitting its stride and the 2009 H1N1 virus spreading, the public health advocacy group Trust for America's Health today called for greater efforts to increase flu vaccine coverage, saying only 35.7% of working-age adults were vaccinated last season.
An outbreak of H5N1 avian flu has destroyed 50,000 chickens at a farm in China, and four H5N1 outbreaks in Vietnam have led to the deaths of almost 10,000 poultry, according to separate reports filed with the World Organization for Animal Health (OIE).
With peak likely still to come, concern heightens over H1N1 sickening middle-aged patients this season.
Increased demand and manufacturing delays are expected to cause a temporary shortage of the liquid form of the influenza drug oseltamivir (Tamiflu) in coming days, the Food and Drug Administration (FDA) announced on its Web site.
The oral suspension formulation is intended for small children and others who can't swallow capsules.
Nearly half of US states are reporting widespread flu activity, up from 10 last week.
A serologic survey from British Columbia suggests that preschool children and working-age adults are the groups most susceptible to the pandemic 2009 H1N1 influenza virus, by far the most common strain in North America so far this flu season.
Taiwan has confirmed a second case of H7N9 avian flu, in an 86-year-old man who lives in Jiangsu province in mainland China, according to a news release today from Hong Kong's Centre for Health Protection (CHP).
A number of parameters indicate rapid spread in some US regions, with 2009 H1N1 the predominant strain.
News of a severe ILI cluster in Texas parallels a dramatic flu rise—mostly from H1N1—in the region and nation.
An flu-like illness cluster has hospitalized eight people with severe infections, four of them fatal, and tests show 2009 H1N1 flu in one of the survivors.
