Delaware Health Officials Issued Whooping Cough Alert
The state reported 13 whooping cough cases in 2026 as officials advised residents on vaccination and prevention.
Updated on Sept. 28, 2026 in Asthma
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The Delaware Division of Public Health has issued a health advisory regarding an increase in whooping cough cases across the state. Officials noted that 13 cases have been recorded in 2026, targeting infants and adolescents as those at the highest risk.
Why it matters
Infants face the most significant danger from severe illness, and protection from childhood vaccinations often wanes in older adolescents. Medical experts emphasize that immunization during pregnancy and consistent booster schedules remain the best defenses against severe infection.
Vaccination during pregnancy reduces the risk of whooping cough in infants under 2 months by 78%. Additionally, Tdap vaccines protect 9 out of 10 infants from severe hospitalizations.
The players
Delaware Division of Public Health
This state agency is responsible for monitoring community health and managing the response to communicable disease outbreaks in Delaware.
The details
Clinicians are using nasal swab PCR testing to identify pertussis infections in patients. Once identified, health authorities require both infected individuals and their close contacts to undergo antibiotic treatment to prevent further spread.
Timeline
One whooping cough case was recorded in 2023.
Delaware recorded 45 whooping cough cases in 2024.
State health records show 11 whooping cough cases in 2025.
Cases began an upward trend on June 11, 2026.
Health Advisory 535 was issued on August 12, 2026.
The Big Picture
This case surge illustrates how fluctuations in community immunity relative to the national recommended Tdap vaccination schedule can lead to localized outbreaks. Public health efforts are focused on reinforcing these established immunization benchmarks to prevent further transmission.
Parents and adolescents should consult with their healthcare providers to ensure Tdap vaccination records are current. Those identified as close contacts to a confirmed case must complete a prescribed course of antibiotics to minimize health risks.
The takeaway
Maintaining timely vaccination during pregnancy and adolescence provides critical protection for the most vulnerable members of the community. Residents should prioritize routine check-ups to ensure all necessary boosters are administered on schedule.
Further reading
Learn more about respiratory health and disease management on the Delaware Asthma page.
Source note: This article includes information reported by Medical Daily.
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Would you check your household's vaccination status to protect vulnerable infants from whooping cough?
