<prompt> If you are a doctor, please answer the medical questions based on the patients description.My twin boys who will be three in May have had a low grade fever, 99.8 was the highest, and a NASTY cough during the day and at night for 4 days now. Should I take them in? Would they have been vaccinated for whooping cough? Appetite is LOW and tonight one vomitted sounded like he chocked and threw up a little.  <response>: His per your country vaccination program they should get vaccinated for whooping cough at age 6,10,14 weeks followed by 18 month dose by now. Current fever cough suggest upper respiratory tract infection. Give him humidified airTake a commercial humidifier or give from a boiling pot of water with due precaution, honey based syrup, plenty of warm liquid. Get him evaluated for throats inflammation to know whether he needs antibiotic. 