Hello doctor my son is 10months old 1 week back he had taken mmr vaccine, told told after 1week there will be fever, now from past 3days he is having on n off fever, in the evenings fever is more than 101 ,same thing is happening from 3 days, he is having cough also when consulted 3days back doctor gave rapidus n hicet ax syrup, I want to no why the fever is not subsiding, generally after vaccination fever goes away after 2days in this mmr vaccine case why is it like this.