Jan 21, 2013 1:54 PM by NBC News
Giving children the DTap vaccine in their thigh, rather than their arm, lessens the chance they will have a reaction.
The chance of a child having a reaction to the vaccine is very low. If they do, it usually involves swelling around the injection site.
Researchers in Seattle found toddlers given the shot in their thigh were nearly half as likely to have a reaction that required a visit to the doctor, nurse or ER.
Experts believe this happens because the thigh muscle is larger and can handle the vaccine volume better.
DTaP protects against diptheria, tetanus and pertussis.
The researchers did not find a benefit for other vaccines, like the flu shot.
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