According to the preliminary results of a new US study, the vaccine for whooping cough commonly administered to young children loses its effectiveness after three years.
The results come from a survey of 15,000 children in Marin County, California, where an outbreak of the bacterial disease killed 11 infants and infected more than 8,000 people in 2010.
From news.yahoo.com:
“When we first started having a pertussis outbreak, we assumed that this would be primarily in the unvaccinated population,” Dr David Witt, of Kaiser Permanente Medical Center in San Rafael, California told a conference in Chicago, using the scientific name for the once-common childhood disease.
“What we pretty quickly identify is that the bulk of the outbreak was in fully vaccinated children” in the 8-12 age group, he said.
“Older kids and younger kids seemed to be pretty well protected but the age of eight to 12 was the vast bulk of the cases. And when we examined that, it was correlated to being more than three years from the last vaccine booster dose.”
The preliminary results were presented at the Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) organized by the American Society of Microbiology.










