Usually the vaccine can be given starting the age of 12m, but when there is a risk of contagion, it is protective only if given within 72hours of the contamination.
So depending on your other son 's age and the delay since the first one has developed signs of the disease, you can decide with your pediatrician if it is still useful to get him vaccinated.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.