What reactions are expected following H1N1 vaccine?
Most reactions to the vaccine are minor. Canada has a vaccine safety surveillance program to report and investigate any serious or unexpected reactions to the vaccine. Serious adverse events following immunization are rare. Clinical trials found the most common reactions after getting the adjuvanted vaccine were minor and included pain, swelling at the injection site and redness at the injection site, and mild swelling and pain under the arm on the same side of the body that the shot was given. This is to be expected because the adjuvant helps the body develop a stronger immune response by increasing the inflammatory response. Other commonly reported reactions were fatigue, muscle and joint pain, headache, fever and chills, and in younger childen, fever, drowsiness, irritability and loss of appetite were also reported in low levels. In younger children a fever, drowsiness, irritability and loss of appetite were also reported in low levels. Adverse events can happen with any vaccine, an
