Fever is part of the normal inflammatory response and most frequently occurs in response to infection. It is also often seen after vaccination, particularly in children following immunisation with diphtheria-tetanus-pertuses, measles and pneumococcal conjugate vaccines.
Prophylactic paracetamol administered during the first 24 hours significantly reduced febrile reactions reported within 4 days of vaccination but had no effect on the occurence of fever higher than 39,5 °C. However at same time GMCs and GMTs for a number of vaccine antigens were reduced in the group receiving prophylactic paracetamol compared to those not receiving paracetamol.