The flu vaccine is the most widely used in the United States, but people who have had a flu shot are less likely to get it, according to a study published Wednesday in the Journal of Infectious Diseases.
Researchers from the University of Texas Health Science Center at Houston looked at data from the National Health and Nutrition Examination Survey, a biennial survey of U.S. adults that is taken every three months.
Researchers found that, for the first time, flu shots did not lower the rate of flu vaccination among people who had received a flu vaccine in the previous year.
The study found that among those who received a jab in the first year, there was a 33% reduction in the rate at which flu shots were taken compared with those who did not.
The number of flu shots taken dropped by 13.7% in the year after a jab, and dropped by 2.6% in those who took a jab three or more years after receiving a jab.
For people who were vaccinated with a jab and had received at least one flu shot in the past year, the drop in vaccination rates was even greater.
There was a 9.5% drop in flu vaccine-exposed individuals who did and a 4.3% drop for those who had not.
The researchers wrote that this finding was consistent with previous studies.
However, it was unclear whether the difference in vaccination rate between those who were receiving a flu jab in a previous year and those who didn’t was because people who took the jab in 2014 had not had the vaccine or because those who got the vaccine in 2014 took fewer shots.
The authors also found that the reduction in flu vaccination rates among those in the study who were not vaccinated was not statistically significant.
They suggested that it could be because the vaccine was administered in a way that made it easier to catch the flu and that people who did receive the vaccine were less likely than those who weren’t to be vaccinated.
The flu vaccine can be given to people in the community as a single shot, or as two doses, and it can be injected into the nose, or into the mouth.
The Centers for Disease Control and Prevention (CDC) said it is recommending that people take two doses of the influenza vaccine each year.
However it said that the vaccine can safely be given as a double dose, and people can also get a third dose if they need it.
The CDC recommends that people get vaccinated if they have been vaccinated during the last flu season.
People can also obtain a flu vaccination if they are currently vaccinated and are at high risk of catching the flu.
The vaccine should be administered within 72 hours after the last dose has been given, according the CDC.
The National Institutes of Health (NIH) said Wednesday that the number of people who received the flu shot last year increased by 17 million people, or 2.7%, to 4.6 million people.
The vaccine was the most commonly administered vaccine in a third of all people ages 4 to 74 in 2014, the NIH said.
It is recommended that people receive at least three doses of flu vaccine during the flu season, according, the CDC said.
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