Rate of invasive bacterial infection in recently vaccinated young infants with fever without source.

Although the rate of UTI in recently immunised infants 42-90 days old with fever without a source is lower than in those not recently immunised, recommending screening for UTI seems appropriate. If the lower rate of IBI among recently immunised well-appearing infants is confirmed, the recommendation to systematically perform blood tests in these infants should be reconsidered.