We investigated seroconversion rates in febrile children after measles vaccination. Among 6,364 vaccinees, 501 children had a temperature of 37.5°C or higher within 7 days of vaccination. The seroconversion rate assessed by a hemagglutination-inhibition assay was 76.6% in 501 febrile children, whereas it was 95.2% in 84 afebrile controls.
- primary vaccine failure
- upper respiratory infection