Two children in the United States have died from whooping cough so far this year, and reported pertussis cases have now climbed past 4,500, according to the CDC’s provisional surveillance data. One of those deaths occurred in South Dakota, where health officials confirmed a child died from a co-infection of pertussis and influenza. The toll arrives as infants and young children remain the most vulnerable to severe complications from the disease, and as questions grow about whether the rising case count reflects a true surge in infections or shifts in how cases are detected and reported.
Two pediatric deaths and 4,500 cases signal a dangerous year for pertussis
The headline numbers carry real weight for families with newborns and young children. The CDC’s National Notifiable Diseases Surveillance System, a dataset accessible through the agency’s weekly pertussis table, shows cumulative year-to-date pertussis notifications exceeding 4,500 as of late July 2026. That figure comes from voluntary reports submitted by state and local jurisdictions, meaning the actual number of infections is almost certainly higher. Pertussis is notoriously underdiagnosed, particularly in older children and adults whose symptoms can mimic a lingering cold or mild bronchitis.
The two pediatric deaths sharpen the urgency. The South Dakota health department confirmed one of those fatalities involved a child who had both pertussis and influenza at the time of death. That co-infection detail matters because it complicates the clinical picture: families and clinicians need to recognize that whooping cough can overlap with other respiratory viruses, compounding the danger for the youngest patients. Infants face the highest rates of pertussis-related hospitalization and death, according to the CDC’s pertussis surveillance program and a 2018 MMWR report on prevention strategy, which have consistently shown that babies too young to be fully vaccinated bear a disproportionate share of severe outcomes.
A central question hangs over the 4,500-plus total. Provisional NNDSS counts are, by the CDC’s own documentation, subject to revision as jurisdictions finalize their data. Weekly figures can be revised upward or downward in subsequent reporting periods as late lab results arrive or as health departments reclassify cases that do not meet the national definition. That built-in uncertainty means the current number is a snapshot, not a settled count. It also means that comparing raw weekly totals from 2026 against prior years requires caution, because reporting lags and corrections can distort apparent trends in either direction.
Even with those caveats, surpassing 4,500 reports by midsummer places 2026 among the more active pertussis years of the past decade. Many recent seasons have seen lower midyear tallies, with larger spikes clustered in recognized outbreak years. Whether this year ultimately lands in that category will depend on how steeply the curve rises through late summer and fall, when pertussis sometimes accelerates alongside other respiratory infections.
Testing patterns and case definitions shape what the numbers actually mean
One hypothesis worth examining is whether the climb past 4,500 cases partly reflects broader use of PCR-based diagnostic testing rather than a proportional increase in actual infections. PCR tests are more sensitive than older culture-based methods and can detect pertussis DNA even when bacteria are no longer viable. Wider adoption across clinics, urgent care centers, and emergency departments could push more mild or borderline cases into the official count simply because they are being looked for more often.
If that is a factor, the week-by-week growth pattern in the NNDSS dataset would look different from historical years when PCR was less common. A testing-driven increase would tend to show a steadier upward slope as clinicians order more respiratory panels and targeted pertussis tests, rather than the sharp seasonal peaks typical of true outbreak years driven by intense community transmission. However, without detailed national data on how many tests are being ordered and in which settings, it is difficult to disentangle the contribution of testing behavior from changes in the underlying epidemiology.
The standard that determines what qualifies as a reported case also plays a role. Jurisdictions classify pertussis using the 2020 case definition established by the Council of State and Territorial Epidemiologists and adopted by the CDC for NNDSS reporting. That definition sets specific clinical, laboratory, and epidemiologic criteria that a case must meet before it enters the national count, such as a prolonged cough with characteristic features, a positive PCR or culture, or a clear epidemiologic link to a confirmed case. Any change in how laboratories apply those criteria, or in how aggressively clinicians order confirmatory tests, can shift the denominator in ways that look like a change in disease activity even if the underlying biology has not changed.
None of this means the current numbers are inflated or unreliable. It means that interpreting them requires context that raw weekly tables do not provide on their own. The CDC’s annual surveillance reports, which include age-stratified breakdowns of cases and deaths, offer a more complete picture, but those reports typically lag by a year or more. For 2026, the provisional weekly data is the best available real-time signal, and it is signaling a year in which very young children, in particular, face elevated risk.
Gaps in the data and what parents should watch for next
Several pieces of the puzzle are still missing. The NNDSS weekly dataset provides cumulative totals but does not break out deaths by age group for the current year. That means the public knows two children have died, but the detailed demographic profile of those deaths, including the children’s exact ages, underlying medical conditions, and vaccination status, is not yet available in the national surveillance tables. Only one of the two deaths has been publicly detailed through a state press release, leaving the second case largely opaque outside the health department handling it.
State-level vaccination coverage data tied to the current case increase has not been published alongside the surveillance figures. That gap matters because pertussis outbreaks historically correlate with pockets of undervaccination, whether due to access barriers, missed well-child visits, or vaccine hesitancy. Without current coverage data matched to the jurisdictions reporting the most cases, it is difficult to determine whether declining immunization rates are driving the 2026 numbers or whether other factors, such as waning immunity from earlier vaccination, are more significant contributors.
For parents and caregivers, the practical takeaway is direct. The CDC’s Advisory Committee on Immunization Practices recommends Tdap vaccination during every pregnancy, typically in the third trimester, to pass protective antibodies to newborns before they are old enough to begin their own vaccine series. Infants then receive a series of DTaP doses starting at two months of age, with additional doses in early childhood and a Tdap booster in adolescence. Keeping that schedule up to date is the most effective way to reduce the risk of severe pertussis in households and communities.
Parents should also be alert to the classic signs of whooping cough, especially in babies. Early symptoms can resemble a common cold: runny nose, mild cough, and low-grade fever. As the illness progresses, the cough may become more intense, with rapid fits that make it hard for the child to breathe, followed by a high-pitched “whoop” sound when they inhale. In very young infants, the whoop may be absent; instead, they may pause breathing, turn dusky or blue, or struggle to feed. Any of these signs warrant urgent medical evaluation, even in vaccinated children, because no vaccine provides perfect protection.
Families can look to federal public health agencies for updated guidance as the year unfolds. The U.S. Department of Health and Human Services maintains centralized information on vaccines and infectious diseases through its main public health portal, which links to CDC recommendations, immunization schedules, and resources for finding low- or no-cost vaccination clinics. As more detailed 2026 pertussis data becomes available, those channels are likely to be among the first to highlight shifts in risk or changes to prevention advice.
For now, the combination of two pediatric deaths, thousands of reported cases, and the inherent vulnerabilities of infants is enough to justify renewed vigilance. Clinicians are being urged to consider pertussis in children with persistent cough, especially if they are too young to be fully vaccinated or if there is a known exposure. Parents are being asked to keep routine pediatric visits on the calendar, confirm that older siblings and caregivers are up to date on Tdap, and seek care quickly if a baby’s cough worsens or breathing seems labored. The surveillance tables may still be provisional, but for the families most at risk, the stakes are already painfully real.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
