Hib disease returns as vaccination rates fall

Hib disease vaccination rates fall across the United States, and doctors warn that a once-rare but deadly infection could return.

Before vaccines became widely available, Haemophilus influenzae type b — known as Hib — infected about 20,000 children each year in the U.S. The disease killed around 1,000 and left many others with permanent brain damage, according to the Centers for Disease Control and Prevention.

Vaccination nearly eliminated those cases. Today, however, declining immunization rates are raising alarm among pediatricians who fear a resurgence.

Doctors warn of a dangerous comeback

Health data shows that fewer children are receiving the full Hib vaccine series. Coverage dropped from 78.8% in 2019 to 77.6% in 2021.

That decline may seem small, but doctors say even slight drops can allow highly contagious diseases to spread again.

Some pediatricians are already seeing cases that had nearly disappeared. In recent months, hospitals have treated children with severe Hib infections, including meningitis. In one reported case, an unvaccinated infant died.

“We may have to go back to seeing emergency rooms filled with very sick children,” said Dr. Leisha Nolen, a state epidemiologist.

The trend reflects broader vaccine hesitancy across the country. Studies show childhood vaccination rates have fallen in most U.S. regions since 2019.

A shift in how doctors practice

The return of Hib is forcing doctors to rethink how they diagnose and treat routine illnesses.

Previously, many physicians did not consider Hib when evaluating symptoms like sore throat or fever. Now, they must include it as a possible diagnosis — especially in unvaccinated patients.

That change could lead to more hospital admissions, additional testing and more aggressive treatment.

“It’s the changing world of medicine,” said one pediatrician, noting that diseases once considered eradicated are now part of daily clinical decisions again.

What makes Hib so dangerous

Hib is a bacterial infection that spreads through respiratory droplets, even from people who show no symptoms.

In mild cases, it can cause ear infections. But in severe cases, it attacks the bloodstream, lungs or brain.

The most feared complication is meningitis, a life-threatening inflammation of the brain and spinal cord. Before vaccines, it was one of the leading causes of bacterial meningitis in children under five.

Doctors say the vaccine remains highly effective, preventing more than 90% of serious infections when the full series is completed.

Families and doctors urge vaccination

For families affected by Hib, the disease’s impact is devastating.

Parents who have lost children or seen severe complications are now speaking out, urging others to vaccinate. They warn that even children with partial protection or underlying conditions can face life-threatening risks.

Doctors echo that message. They stress that vaccination protects not only individual children but also vulnerable groups, including infants and those with weakened immune systems.

As Hib disease vaccination rates fall, health experts say the lesson is clear: diseases once pushed into the past can return quickly when immunization declines.