Whooping cough (a.k.a. pertussis) is having a very un-fun comeback tour in the United States.And yesthis is happening in a country where most of us have access to modern vaccines.So what gives? Did the bacteria get a glow-up? Did the vaccine forget how to do its job?Or are we all just collectively pretending boosters are “optional side quests”?
The real answer is more complicated (and more interesting) than “vaccines don’t work.”Today’s pertussis vaccines are effectiveespecially at preventing severe disease in kidsbutprotection fades, coverage has holes, and the real world is messy. Add in post-pandemic behavior changes,uneven vaccination rates, and a germ that’s very good at finding the gaps, and you get rising case counts.Let’s break it down without the doom-and-gloom… and without pretending this is a mystery novel where the vaccine is the villain.
Whooping cough in 60 seconds (no medical degree required)
Pertussis is a contagious respiratory infection caused by Bordetella pertussis.It often starts like a plain old coldrunny nose, mild fever, sneaky coughthen escalates intocoughing fits that can last for weeks. In babies, it can be especially dangerous, because they’re too youngto be fully protected by their own vaccine series and can struggle to breathe or feed during severe illness.
Here’s the tricky part: teens and adults can get pertussis too, but their symptoms can look like “a stubborn cough”or “that thing going around school/work.” Which means pertussis can spread quietlyright into the path of infants,who are the most vulnerable.
The numbers: pertussis didn’t disappearit just took a pandemic nap
During the early COVID years, whooping cough reports dropped sharply. That didn’t mean the bacteria retired.Masking, remote schooling, fewer gatherings, and changes in health care visits likely reduced transmission and reporting.Now that daily life looks more like 2019, pertussis is returning to its typical patternsoften with surges that catch people off guard.
The CDC notes that reported pertussis cases increased substantially in 2024 compared with 2023, and that preliminary 2024 totalswere higher than what was seen in 2019 (pre-pandemic). Even in “normal” times, the U.S. typically sees more than 10,000 casesreported per year, with periodic peakslike the major one in 2012.
So what’s the “new vaccine,” and why didn’t it end whooping cough?
When people say “new vaccine” in the whooping cough conversation, they’re often talking about the modern acellularpertussis vaccines (DTaP for young children and Tdap for older kids and adults). These replaced older whole-cellpertussis vaccines decades ago in the U.S.
The switch made sense: acellular vaccines are associated with fewer side effects than the older whole-cell versions.But the tradeoffbased on years of epidemiology and immunology researchis that acellular protection can fade faster than we’d like.In other words: the newer vaccine is “cleaner,” but it may not be as durable at population level as the old-school version.
And to be extra clear: this does not mean the vaccines are useless. It means pertussis is the kind of pathogen thatpunishes complacency. Think of vaccination like weatherproofing your house: it reduces damage dramatically, but if you leave a window open(missed doses, delayed boosters, local low coverage), the storm finds it.
The big reasons whooping cough is rising
1) Immunity fades (because biology refuses to be convenient)
Protection from pertussis vaccination decreases over time. That’s one reason kids get a multi-dose DTaP series and then a Tdap boosteraround 11–12 years old. Adults who haven’t had Tdap should get a dose, and many adults will get Tdap again as part of periodic tetanus boosters.
The problem isn’t that immunity vanishes overnightit’s that, year by year, more people drift from “well protected” to“kind of protected” to “I thought I was protected?” If a community has enough people in that last category, pertussis gains momentum.
2) The vaccine is better at preventing severe disease than blocking every infection
With pertussis, “protected” doesn’t always mean “can’t catch it” or “can’t spread it.” Vaccinated people can still get infected,often with milder symptoms, and may not realize what they have. That’s good news for the vaccinated personbut it can be bad news for an infantwho catches it from a well-meaning relative with a “lingering cough.”
This is one reason public health messaging emphasizes protecting babies through a layered approach: keeping household members up to date on vaccines,taking symptoms seriously, and using maternal vaccination during pregnancy to provide early protection to newborns.
3) Coverage gaps: missed shots, delayed schedules, and pockets of low vaccination
Pertussis thrives when vaccination coverage is uneven. If most people are vaccinated but a few schools, neighborhoods, or social networks havesignificantly lower coverage, outbreaks don’t need the whole countrythey just need the right cluster.
Add pandemic-era disruptions (missed well-child visits, delayed routine care) and a rise in vaccine skepticism in some areas,and the bacteria gets more opportunities. Even short-term drops in on-time childhood vaccines can create a longer-term ripple effect,because pertussis transmission chains can build before anyone realizes it’s “that kind of cough.”
4) Teens and adults are the accidental “delivery system” to infants
Babies start their DTaP series at 2 months, but they aren’t fully protected right away. That windowearly infancyis when pertussis can be most severe.Meanwhile, adolescents and adults may have waned immunity and may not recognize symptoms. The result is a classic (and frustrating) pattern:the disease circulates among older age groups and then lands hardest on babies.
That’s why Tdap during each pregnancy is such a big deal: it helps pass protective antibodies to the baby before birth,lowering the risk of whooping cough in the first months of life.
5) Better testing and awareness can make increases look even bigger
Pertussis is historically underdiagnosed and underreported. Coughs are common; pertussis testing is not always done.Over the years, improved access to diagnostics (including PCR testing) and greater awareness among clinicians can increase reported case counts.That’s not “fake inflation”it’s the public health system seeing more of what was already there.
The CDC notes that improved recognition, increased laboratory diagnostics, and surveillance changes are among factors that likely contributed toincreasing reports since the 1980salongside waning immunity from acellular vaccines.
6) The bacteria changes, too (because of course it does)
Bordetella pertussis isn’t static. Researchers have documented shifts in circulating strains, including strains that don’t producecertain proteins targeted by acellular vaccines (for example, pertactin-deficient strains).
This doesn’t translate neatly into “the vaccine no longer works,” but it does suggest the organism is adapting under immune pressure.Think of it as bacteria doing what bacteria do: evolving in a world where many hosts have some level of immunity.It’s one reason scientists continue exploring next-generation vaccines designed to produce broader or longer-lasting protection.
What prevention actually looks like (in the real world, not a perfect brochure)
Stay on schedule (and catch up if you’re behind)
The childhood schedule is designed to protect kids early, then reinforce protection as they grow. In the U.S., kids typically receivea 5-dose DTaP series in early childhood, followed by a Tdap booster at 11–12 years old. If someone missed doses,clinicians can use catch-up schedules to get them protected.
Pregnancy: the “protect the baby before they can be vaccinated” strategy
CDC guidance recommends Tdap during each pregnancy, ideally between 27 and 36 weeks (earlier in that window is often preferred).This can significantly reduce the risk of pertussis in babies younger than 2 monthsbefore they’ve had time to build their own protection.
Take prolonged coughs seriouslyespecially around babies
If someone has a persistent cough with coughing fits, vomiting after coughing, or a “whoop” sound (more common in kids),it’s worth getting medical advice and asking about pertussis testing. Early treatment may reduce severity and can help reduce spread,especially to high-risk contacts like infants.
Layered protection beats “one magic fix”
Vaccination is the foundation, but it’s not the only tool. Staying home when sick, improving ventilation, masking during outbreaks(especially around newborns), and prompt medical care can all reduce transmission. You don’t need to live in a bubbleyou just need to treat “that cough” like it might be more than allergies when a baby is involved.
Are truly “new” pertussis vaccines coming?
Researchers are working on next-generation pertussis vaccines, including approaches that aim to reduce nasal colonization and transmission,not just severe disease. Some candidates explore intranasal delivery and other strategies intended to create stronger mucosal immunity.
That’s promisingbecause if you can cut transmission, you can protect infants indirectly. But vaccine development, testing, and approval take time,and today’s best protection still relies on using DTaP/Tdap effectively, keeping coverage high, and focusing on pregnancy vaccination for newborn protection.
Bottom line: the vaccine isn’t failingour “system” is leaky
Whooping cough is rising because immunity wanes, coverage isn’t uniform, and pertussis spreads easily through everyday life.The modern vaccine is still a major reason we’re not seeing pre-vaccine-era devastationyet it’s not a permanent shield.The fix isn’t panic. It’s consistency: on-time childhood doses, adolescent boosters, pregnancy Tdap, and quick action when cough outbreaks appear.
If you’re unsure about your family’s vaccine status, the most practical next step is simple:check records, talk to a clinician, and make a catch-up plan if needed. Pertussis is annoying when it’s mild,but it can be dangerous in babiesand that’s exactly why prevention matters.
Experiences from real life: what pertussis “looks like” when it resurges (about )
If you ask pediatric clinics what whooping cough feels like during a surge, the first answer is usually: “It doesn’t announce itself.”Families often describe a kid who “just has a cold” for a weekmaybe two. Then the cough changes. It becomes dramatic, stubborn, and oddly exhausting,like the body has turned coughing into a competitive sport no one signed up for.
In schools, a familiar pattern shows up. A few students develop lingering coughs after a seasonal wave of sniffles. A nurse hears that the coughcomes in fitsespecially at nightand notices some kids end a coughing spell red-faced and breathless. Parents might assume it’s asthma, reflux,allergies, or “that bronchitis that’s going around.” Often it’s only after a test confirms pertussis in one student that the puzzle piecessuddenly snap together: oh, that’s why the cough sounds the same across different classrooms.
Another common story involves teenagers. They’re vaccinated, they’re busy, and they’re not thrilled about missing practice or performances.Their symptoms might be mild enough that no one suspects pertussisuntil the cough hangs on for weeks and spreads to family members.Teens rarely do the classic “whoop,” so the infection can pass as a generic respiratory bug. The irony is that mild illness in older kids and adultscan still be a serious threat to infants.
New parents often experience pertussis differently: as a constant mental math problem. “Who’s holding the baby?”“Did everyone wash their hands?” “Why is my aunt insisting her cough is ‘just dryness’?” When pertussis is circulating,families are often forced to set awkward boundariesasking visitors to postpone, masking around newborns, or requesting updated Tdap vaccination.These conversations can feel socially uncomfortable, but parents who’ve watched a newborn struggle with a respiratory illness rarely regret being cautious.
Clinicians also describe how fast the emotional temperature changes once a baby is involved. A coughing teenager is a nuisance.A coughing infant is urgent. Babies may not cough loudly; instead, they may pause breathing, have trouble feeding, or seem unusually tired.That’s why pregnancy Tdap and protecting newborns through family vaccination and smart precautions are emphasized so strongly:the goal is to prevent the scariest scenarios before they have a chance to begin.
Public health teams have their own “pertussis surge” experience: long days of contact notifications, school coordination,and repeated reminders that antibiotics and vaccination are different tools for different jobs. During outbreaks, people often ask,“If I was vaccinated, why do I need to do anything?” The practical answer is: because pertussis doesn’t care about our assumptions.Vaccination reduces risk and severity, but when a highly contagious bacteria is circulatingespecially around infantslayered protection(testing, treatment when appropriate, and up-to-date vaccines) is how communities slow the spread.
The good news in these stories is that the same theme keeps returning: once people recognize pertussis early and respond consistently,outbreaks become manageable. The hard part is getting from “it’s just a cough” to “let’s check and protect the vulnerable” before the bacteriahas already made the rounds.
