Studies have not shown there is any benefit for most adults getting more than one dose of vaccine in the same flu season. However, it’s recommended that some people get 2 doses of the flu vaccine in one season: children under 9 years old who have not ever been vaccinated against the flu people who are having flu vaccination for the first time after a stem cell transplant or organ transplant pregnant women, who may be vaccinated with the next season’s influenza vaccine if it becomes available in the latter part of their pregnancy, even if they had the previous season’s vaccine overseas travellers who are going to the northern hemisphere winter