I was sure of my childhood vaccination history and not sure whether I had received an adult booster shot or not. The pharmacist was happy to give me the shot. M

I was sure of my childhood vaccination history and not sure whether I had received an adult booster shot or not. The pharmacist was happy to give me the shot. My doctor subsequently said that medical advice about this might depend on one's particular situation (e.g. travel plans), since different people's risk of either acquiring or spreading measles could vary. Subsequent shots don't decrease one's immunity, but they can still produce the same side effects as the initial vaccination, which are usually mild. For example, I experienced mild arm soreness for four to five days, which is the most common MMR side effect. Feel free to ask your own doctor or pharmacist! :-)