Over 1.5 billion people can't hear properly. You might think hearing loss only happens with age, but childhood infections cause more hearing problems than most realize.
Researchers at the University of Montreal, with colleagues at the University of Washington and Yale School of Public Health, have found that we could prevent most of these cases with vaccines kids might already be getting.
Why it matters
According to the World Health Organization, nearly 60% of childhood hearing loss could be prevented with vaccines, potentially saving millions of children's hearing with shots they're likely already scheduled to receive.
By the numbers
When researchers dug into our knowledge, they found shocking gaps:
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26 diseases can steal a child's hearing.
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In 40 years, only 9 studies checked if vaccines protect hearing.
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Those studies? They only examined 3 diseases: rubella, mumps, and pneumococcus.
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All studies occurred in wealthy countries like the US, Sweden, and Australia.
The big picture
Diseases that rob children of their hearing are often preventable.
- Rubella during pregnancy can cause babies to be born deaf.
- Mumps attacks the inner ear.
- Bacterial meningitis from diseases like pneumococcus can cause permanent hearing damage.
Yet we're not tracking how well vaccines prevent these problems. Most vaccine trials focus on one thing: does the shot prevent the main disease? They ignore whether it saves hearing.
A closer look
When researchers found actual evidence, the story became clear.
- Australia began vaccinating against rubella, resulting in fewer babies born with hearing loss.
- Sweden rolled out their MMR vaccine program and saw a drop in children’s hearing problems.
- Studies in Japan and the US proved mumps vaccines protect against hearing loss.
The pneumococcus vaccine results were inconsistent. Three trials found it didn't help middle ear infections, but those infections don't always cause permanent hearing loss.
The challenge
Most research happens in rich countries where vaccines are common. Meanwhile, the biggest need is in poorer countries with fewer vaccinated children and nearly impossible hearing care access.
Mira Johri, PhD, who led the study, points to Montreal's history. Decades ago, the city needed a special institute for deaf children. Now? Thanks to antibiotics and vaccines, many fewer Canadian kids lose their hearing.
"This is a success story that could be replicated around the world," — Dr. Mira Johri, public health scientist, Professor, University of Montreal
Researchers want vaccine makers to track hearing loss prevention during new shot tests and public health officials to discuss hearing benefits in vaccine promotion.
Better information could convince parents and strengthen the argument for vaccine programs in countries that need them.
The bottom line: Vaccines save lives. With smarter research and better awareness, they could save millions of children's hearing.
Healthy children's hearing starts here
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