The percentage of Americans who had received a flu shot by the end of the 2011-12 flu season was 47.6.
There is a rush on now to get a flu vaccine, but figures published last month for this season — the latest available from the Centers for Disease Control and Prevention — suggested that most people would again take their chances and go through the flu season without a vaccination.
The C.D.C. uses two sources to estimate what it calls "uptake": the National Immunization Survey, which is a telephone survey of households with children, and the National Internet Flu Survey, which collects vaccination-related data by age, race and ethnicity.
The number, about the same as it was at the same time in 2011, was not encouraging. As of mid-November, only 36.5 percent of people older than 6 months had been vaccinated.
"It's likely that coverage may be higher than last year, but how much higher we don't know," said James A. Singleton, an epidemiologist with the C.D.C.
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