The incidence of whooping cough, also known as whooping cough or whooping cough, is is increasing In Texas, Florida, California, Oregon and other cities and states.
Interviews with state and federal health officials say these outbreaks are driven by declining vaccination rates, low immunity, and delays in public health surveillance systems. Babies who have not yet received a complete immunization schedule are most at risk.
“There are periodic increases in whooping cough cases due to weakened immunity, but the scale of outbreaks and the risk of serious outcomes in children who cannot be vaccinated can be reduced with high coverage and good communication with those at risk,” said Demetre Daskalakis, former director of the immunization program at the U.S. Centers for Disease Control and Prevention (CDC), who resigned in August.
Before the first whooping cough vaccine was developed in the early 20th centuryThis disease was one of the most common diseases in childhood. Leading cause of death among children in the United States.
Today, children receive a series of DTaP vaccines (high-dose version) starting at 2 months of age, and adolescents and adults receive a booster dose of Tdap (low-dose version) every 10 years. (Both vaccines also protect against diphtheria and tetanus.)
Until recently, 8 out of 10 children They received four doses of DTaP vaccine by the age of two and the cases were controlled. But since the Covid pandemic, coverage has declined and non-medical exemptions have increased in many states, widening the immunization gap. This happens when the proportion of people with immunity falls below the level needed to slow the spread.
texas registration 1,928 cases Whooping cough will occur in 2024. Until October 2025, The state has already surpassed 3,500.. Even at a national level, the numbers are staggering. During the first three months of 2025, 6,600 casesThis is four times the rate last year and 25 times the rate by 2023. Several states are reporting their highest numbers in a decade, and with cases from Louisiana to South Dakota and Idaho, it’s clear that the increase is not local. It has become common.
Key factors for the increase
Texas lawmakers recently passed the following bill: Makes it easier for parents to request exemptions for non-medical reasons. Forms can be downloaded from the Internet based on school immunization requirements. These forms are now sent directly to schools rather than the Department of Health, making tracking difficult.
Phil Huang, director of the Dallas County Department of Health and Human Services, said the full impact of the new rule is not yet known after it begins this school year, but he expects school vaccination rates to continue to decline.
You’ve already seen a significant decline in vaccination rates. Typically during back-to-school season, “our whole front space downstairs is full,” he said. “That wasn’t the case this year.”
Huang believes fear of immigration action could lead some families, especially Hispanic families, to avoid getting vaccinated. Dallas County’s Hispanic population is approximately 40%. “We believe that many people are being disturbed by ICE activities,” he said, referring to Immigration and Customs Enforcement.
There are more complications. The vaccine protects against severe forms of the disease, but like the Covid and flu vaccines, protection against infection wanes over time.
In the 1990s, the United States switched from whole-cell pertussis vaccines to “cell-free” vaccines. This vaccine has fewer side effects but provides shorter protection. Because adults today received acellular vaccines as children, they lose immunity over time and may unknowingly pass the infection to their babies.
babies are more at risk
Whooping cough is especially dangerous for babies under 1 year of age. Some people stop breathing during a coughing attack. Many people require hospitalization. Among them, 1 out of 5 Pneumonia develops and about 1% die.
Because of this high risk, the CDC recommends that pregnant women: Tdap vaccine during each pregnancy. This allows the mother’s antibodies to be passed on to the baby before birth.
In the past, health authorities promoted a ‘cocooning’ strategy (vaccinating both family members and those caring for the baby), but it was difficult to implement because it was difficult to implement in reality. This is no longer recommended as a general rule.. Vaccination of pregnant women and babies over 2 months of age continues to be the most potent immunization.
Better technology can help detect more cases.
modern testing PCR help More cases of whooping cough detected than in the past. Many medical centers now routinely use this laboratory technique to detect multiple respiratory infections at once. Ten years ago, these tests were rare.
CDC experts say this explains part of the increase in cases. But the high number of hospitalizations of babies and the scale of outbreaks in each state show that actual transmission has also increased.
There are concerns about antibiotic resistance
Doctors usually treat whooping cough with: macrolide antibioticsErythromycin, azithromycin, clarithromycin, etc. This medication is most effective in the early stages of the disease and helps prevent it from spreading. Another drug, trimethoprim-sulfamethoxazole, is an option for some babies and adults.
however Macrolide-resistant pertussis This has been common in other countries, especially China, and recent reports show resistance is increasing in Peru. Cases of resistance remain rare in the United States.
CDC officials warn that resistant strains could spread more easily through international travel. Health officials are closely monitoring the situation as treatment options are limited, especially for young babies.
Huang said no cases of resistance have yet been discovered in Dallas County. But he is aware of national concerns.
And now what?
There is no single cause for recurrences of whooping cough. A combination of factors: declining immunization rates; and 60% of pregnant women receiving Tdap, with reduced immunity, better diagnostic tools, and early signs of antibiotic resistance.
Health experts say the solutions must be as complex as the problems.
Across the country, doctors are asked to be alert to the possibility of whooping cough if their patients, especially those caring for children or newborns, have a persistent cough or are vomiting after a coughing fit. Babies who stop breathing or turn purple should seek immediate medical attention.
Obstetricians are encouraged to discuss the Tdap vaccine with each pregnancy. Pediatricians and family physicians are also urged to review the booster vaccination status of adolescents and adults.
Over the past two years, several states have issued health advisories. texasany warning issued We ask doctors to remain vigilant in 2024 and 2025.
Huang said Dallas County is trying to rebuild outreach programs that were cut when COVID funding ended. However, staff is still limited. “There are a lot of factors that make it more difficult,” he said.
He also pointed out that the county now only receives vaccination registration data once a month instead of daily, making it difficult to monitor coverage. “We don’t have it yet… it’s not real-time,” he said.
How to protect young children
As the holiday season approaches, experts recommend that families with newborns take these special precautions:
- Make sure your infant or toddler is up to date on their vaccines, and that all family members have been vaccinated against flu, Covid, and respiratory syncytial virus (RSV).
- Do not receive sick visitors.
- If your baby coughs or stops breathing, seek immediate medical attention.
