Updated 16 January 2017

Newborns get whooping cough from siblings

According to a new study, siblings were the source of whooping cough infection in infants in 36 percent of cases.


Infants are now most likely to catch whooping cough from their brothers and sisters, a new study says.

"Knowing where they're getting their disease from is important so we can target our approach accordingly," said lead authour Tami Skoff, of the Centres for Disease Control and Prevention (CDC) in Atlanta.

Read: Types of cough

Whooping cough, which gets its name from the sound patients make while gasping for air, can be especially dangerous and sometimes deadly for newborns, according to the CDC.

The disease is more formally known as pertussis.

In the past, mothers were thought to be the most common sources of the infection for infants.

For the new study, the researchers used data collected between 2006 and 2013 from 1,306 infants in seven states. About a quarter were younger than two months.

By asking who else had whooping cough roughly one to three weeks before the infant's cough began, the researchers were able to figure out the source of the infection in 44 percent of the infants.

Read: A parent's guide to coughs

When the source of infection could be identified, it was an immediate family member two thirds of the time. Siblings were the source of infection in 36 percent of cases, while mothers were the source in 21 percent and fathers in 10 percent of cases.

Mothers were the main source of infection for infants until about 2008, according the researchers. Then, the main source became brothers and sisters.

The researchers write in Paediatrics that the change isn't surprising, because whooping cough is becoming common in older children. Partly, that's because protection from the newer versions of the whooping cough vaccine becomes weaker over several years.

So, "it makes sense that we're seeing this transition from mothers to siblings as the source of infection," Skoff told Reuters Health.

Read: Vaccinate pregnant moms to prevent whooping cough in babies

She also said the research suggests "cocooning," which is when people around the infant are vaccinated, is likely not effective  especially since her team could find a source of infection less than half the time.

Instead, she said, women should receive the whooping cough vaccine during each pregnancy to pass antibodies to the foetus, and those antibodies can protect the child until he or she is old enough to be vaccinated.

"You're providing direct protection to the mom and direct protection to the infant," Skoff said.

"There are some data out of the UK showing that vaccination during pregnancy is effective," she said. "The early data is very reassuring and promising, which is why we're pushing this strategy."

Read more:

Whooping cough cases reach record high

16 scary symptoms

Is your child's cough keeping you up at night?

Image: Girl coughing from iStock


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Professor Keertan Dheda has received several prestigious awards including the 2014 Oppenheimer Award, and has published over 160 peer-reviewed papers and holds 3 patents related to new TB diagnostic or infection control technologies. He serves on the editorial board of the journals PLoS One, the International Journal of Tuberculosis and Lung Disease, American Journal of Respiratory and Critical Medicine, Lancet Respiratory Diseases and Nature Scientific Reports, amongst others. Read his full biography at the University of Cape Town Lung Institute.

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