New research has shown that protection from whooping cough
(pertussis) weakens a few years after preschool children get their final
diptheria, tetanus and pertussis (DTaP) shot. The current recommendation from
the Centers for Disease Control and Prevention (CDC) is that children receive a
booster between ages 11 and 12.
It’s likely that the trend is linked to a change in the
vaccine in the 1990s. An acellular pertussis vaccine with fewer side effects
was introduced and replaced the original whole-cell vaccine. The new research
notes that children may be at risk of developing whooping cough before age 11
because their immunity is declining from a weaker vaccine.
Dr. H. Cody Meissner is a pediatrician at Tufts University School of Medicine in Boston and notes, “There’s a fairly dramatic and
startling increase in pertussis [whooping cough] in children in the seven to
ten-year old age group.”
Sara Tartof from the Southern California Permanente Medical
Group in Pasadena led the group of researchers on the new study. Immunization
records of 400,000 Minnesota and Oregon children who received the recommended
series of five DTaP shots were analyzed.
“An important thing to remember is the kids who do receive
all five doses on time generally have milder [whooping cough] than those who
are under-vaccinated or unvaccinated,” Tartof said. “Even though there is
waning immunity…getting the five doses on time is still the best protection you
can give your kid.” Parents should continue to follow the CDC’s vaccine schedule.
The CDC Advisory Committee on Immunization Practices has
decided not to recommend an alternative revaccination schedule despite the
waning pertussis protection. The group cited that the risks of pertussis
decrease with age.
“It is so important that people do not interpret this as the vaccine doesn’t work, and then not get vaccinated at all,” Meissner concludes. “Because then we would really have a problem.”
In New York, this is already becoming a problem as the rise
in religious exemptions for children is paralleling a rise in whooping cough
cases. “It’s troubling from an ethical standpoint,” Dr. Jana Shaw, a professor
of pediatrics at SUNY Upstate Medical University states. “If you have gotten an
exemption for your child, not only are they at high risk of [whooping cough],
but you’re putting other children at risk – even those who have been
vaccinated.”
Clay County in Missouri is having a vaccination campaign for
childcare workers, parents and grandparents in July. The Public Health Center
believes that vaccinating those who come into contact with infants will
decrease the cases of whooping cough in the county. Whooping cough is often
unknowingly spread from unvaccinated adults to children who don’t have full
immunity until they are 12-15 months of age.
‘Buffy the Vampire Slayer’ actress Sarah Michelle Gellar is
also supporting the pertussis vaccine. Gellar, who has two small children, has
partnered with March of Dimes to increase awareness about the importance of
childhood vaccines. She also recommends adults be vaccinated for whooping
cough.
Vaccines are one of the best forms of protection for
children. Parents should consult their child’s pediatrician if they have
questions or concerns about the vaccine schedule or a particular vaccine.