What is pertussis and why is it called whooping cough?

Pertussis is a bacterial infection that causes severe, uncontrollable coughing fits. It's called 'whooping cough' because of the characteristic 'whoop' sound people make when gasping for air between coughs. In infants, the disease can be life-threatening, causing apnea (stopped breathing) without the classic whoop.

How does pertussis spread?

Pertussis spreads through respiratory droplets when an infected person coughs or sneezes. It's extremely contagious - people with pertussis typically infect 12-17 close contacts. You can spread the disease from early infection stages, often before you even know you're sick.

What are the stages of pertussis?

Pertussis has three stages: 1) Catarrhal stage (1-2 weeks): mild cold-like symptoms. 2) Paroxysmal stage (1-6 weeks): severe coughing fits with the 'whoop' sound, vomiting after coughing. 3) Convalescent stage (weeks to months): gradual recovery, though coughing can persist for months.

Is the pertussis vaccine effective?

Yes, the DTaP vaccine (for children) and Tdap booster (for adolescents and adults) are effective at preventing pertussis. However, immunity wanes over time, which is why boosters are recommended. Vaccinated people who do get infected typically have much milder symptoms and are less likely to spread the disease.

Why are pertussis cases increasing?

Pertussis cases fluctuate in 3-5 year cycles, and waning immunity from childhood vaccination contributes to adult cases. Increased awareness and better diagnostic testing also reveal more cases. Vaccination remains the best protection, especially for pregnant women to protect newborns.

Where are pertussis outbreaks occurring?

Pertussis outbreaks can occur anywhere, often in schools and communities with lower vaccination rates. Check the live outbreak data above for current pertussis activity in your region.

Pertussis

4 Active Outbreaks

Pertussis, also known as whooping cough, is a highly contagious respiratory disease caused by the bacterium Bordetella pertussis. It causes severe coughing fits that can last for weeks or months.

Countries Affected

844

Recent Cases (30d)

Active Outbreaks

39d ago

Last Updated

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What is Pertussis?

Pertussis, commonly known as whooping cough, gets its name from the distinctive 'whooping' sound made when gasping for air after a coughing fit. Before the vaccine was developed, pertussis was a leading cause of childhood death worldwide. Today, it remains a serious threat, especially to infants who are too young to be fully vaccinated.

Symptoms

Initial cold-like symptoms (runny nose, mild fever)
Severe, uncontrollable coughing fits
Whooping sound when gasping for air
Vomiting after coughing
Exhaustion after coughing fits
Apnea (pauses in breathing) in infants

Transmission

Pertussis spreads through respiratory droplets when an infected person coughs or sneezes. It is highly contagious, especially in the first two weeks when symptoms resemble a common cold. Close contact with infected individuals poses the highest risk.

Contagious Period: From early cold-like symptoms through 3 weeks after coughing begins (or 5 days after starting antibiotics)

Prevention

DTaP vaccine for infants and children (5 doses by age 6)
Tdap booster for adolescents (age 11-12) and adults
Tdap during each pregnancy (27-36 weeks) to protect newborns
Isolation of infected individuals
Prophylactic antibiotics for close contacts
Practice respiratory hygiene and handwashing

Active Outbreaks & Recent Cases

Real-time intelligence from global health monitoring and AI-powered surveillance

Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies

✓ Live data updated in real-time from global health sources

Pertussis Outbreak Hits Young Children in Cameroon

Cameroon 2026-04-25

Active

This event envelope contains reports on pertussis in Cameroon.

Source: BEACON - View Full Report

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Pertussis Outbreak: Australia Faces Record Whooping Cough Cases

Australia 2026-02-17

Active

Australia experienced an unprecedented surge in pertussis (whooping cough) during 2024–25, with more than 82 000 cases reported, disproportionately affecting children under 14 and concentrated in New South Wales and Queensland. The outbreak reflects a convergence of waning population immunity and declining vaccination coverage below the 95% herd‑immunity threshold, compounded by reduced immune boosting during COVID‑19 restrictions and lower uptake among adults and pregnant women. Early 2026 trends remain concerning, with cases already accumulating and warning signs including infant infections, antibiotic resistance, and sustained transmission, indicating the need for strengthened national vaccination and public health responses.

Source: BEACON - View Full Report

466 0

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Guam reports pertussis outbreak first since 2015

Guam 2026-04-14

Active

This event envelope contains reports on pertussis in Guam.

Source: BEACON - View Full Report

173 0

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Honduras Pertussis Outbreak: 91 Cases, Nine Deaths

Honduras 2026-03-28

Active

Honduras is seeing an increase in pertussis cases and infant deaths, with transmission reported across most health regions. This reflects a wider post-pandemic resurgence of whooping cough throughout the Americas, caused by waning immunity and inadequate vaccination coverage.

Source: BEACON - View Full Report

0 0

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Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

Global disease surveillance and guidelines from the World Health Organization

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Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-06-03

Frequently Asked Questions

Common questions about Pertussis answered by our epidemiology team

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