Tuesday, August 14, 2018

Pertussis Vaccine In Pregnancy Protects 9 Of 10 Newborns From Whooping Cough



Pregnant women who have gotten their booster vaccine against whooping cough (pertussis) have reason to cheer: their newborns are far less likely to get the disease than any other babies. One of the largest ever studies looking at the effectiveness of prenatal vaccination against pertussis found the vaccine is more than 91% effective in preventing the life-threatening infection in the first two months of life. That’s greater than the average 85% protection provided by the vaccine after the second shot recommended for babies at 4 months by the Centers for Disease Control and Prevention.
“The bottom line is that receiving Tdap during pregnancy is extremely effective in protecting infants against pertussis across the first year of life,” said senior author Nicola Klein, M.D., Ph.D., co-director of the Kaiser Permanente Vaccine Study Center and a clinical instructor at Stanford University School of Medicine.
The Tdap is the adult version of the DTaP: both vaccines protect against tetanus, diphtheria and pertussis but have slightly different formulations. The high level of maternal antibodies’ effectiveness is likely due to the stronger response of the mother’s more mature immune system. Infants’ immune systems develop antibodies in response to the CDC-recommended DTaP vaccine series, but they remain less mature than an adult’s system.
Since 2013, the CDC has recommended that pregnant women receive a booster shot of the Tdap vaccine in every pregnancy, preferably between 27 and 36 weeks. The vaccine, which protects against pertussis, tetanus and diphtheria, is recommended no matter when a woman’s last booster was—even if it was a year earlier in a previous pregnancy. The reason? Increasing infection rates.
Unlike other vaccine-preventable diseases in the United States, rates of pertussis, or whooping cough, have been increasing in the past decade or so. Several reasons explain the increase, but the biggest contributor is the decreasing immunity provided by the vaccine over time. The immunity a person develops from the vaccine wanes more quickly than the immunity provided by a previous vaccine, abandoned in the 1990s due to more frightening (though not more harmful) vaccine reactions.

Author: Tara Haelle

1 comment:

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