What is the recommended interval between the first and second dose for children under 10 years of age?
Package inserts for the FDA approved vaccines state that the second dose should be given approximately 1 month after the first. CDC recommends that the two doses of 2009 H1N1 monovalent vaccine be separated by 4 weeks. However, if the second dose is separated from the first dose by at least 21 days the second dose can be considered to be valid. If the interval separating the doses is less than 21 days the second dose should be repeated four weeks after the first dose was given.
