s among the 18- to 64-year age group is that the majority of these people probably had underlying medical conditions, such as asthma, cardiac problems and diabetes, Imperato said. These conditions would place them at a higher risk for being hospitalized and of dying if they became infected, he said.
Imperato also noted that "more older people died than children in this epidemic. Yet, older people were not initially included in the priority groups for immunization."
According to the CDC, flu activity has now subsided across the country but most of the flu still circulating is the H1N1 strain. Although flu activity has dropped precipitously, cases of both H1N1 and seasonal flu can still rise and fall, which is what the agency expects to see over the next several months.
The latest data from the CDC finds no states reporting widespread influenza activity and only six reporting regional activity.
"H1N1 flu activity seems to have leveled off, but the virus does continue to circulate causing illness, hospitalizations and deaths," Dr. Anne Schuchat, director of the CDC's National Center for Immunization and Respiratory Diseases, said during a teleconference last week.
And Schuchat warned against any false sense of security. "We are remaining vigilant here and we do not think people should become complacent," she said. "None of us know whether we are going to have bursts of disease or clusters or just ongoing transmission as we have been seeing the past few weeks," she said.
The CDC estimates for H1N1 flu between April 2009 and Jan. 16, 2010 include:
- About 19 million cases and 82,000 hospitalizations and 1,230 deaths among those younger than 18.
- About 33 million cases, 150,000 hospitalizations and 8,980 deaths for those 18 to 64.
- About 5 million cases, 25,000 hospitalizations and 1,480 deaths for those 65 and older.
- The total estimated range of cases is between 41 m
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