Whooping cough (pertussis) in adults - Symptoms, Causes, Treatment & Prevention

📅 Updated: May 2026 ⏱️ 6 min read ✅ Medically reviewed
```html Whooping Cough (Pertussis) in Adults – Complete Medical Guide

Whooping Cough (Pertussis) in Adults – A Comprehensive Guide

Overview

Whooping cough, medically called pertussis, is a contagious respiratory disease caused by the bacterium Bordetella pertussis. Although it is most familiar as a childhood illness, pertussis can affect people of any age. In adults, the disease often presents with a prolonged, severe cough that can be debilitating and may lead to serious complications.

Key facts

  • Worldwide, the World Health Organization (WHO) estimates ~16 million cases of pertussis each year, with about 195,000 deaths, most of them in infants.
  • In the United States, the CDC reported 15,300 pertussis cases in 2023, a 14 % increase from the previous year, and 68 % of those cases occurred in people aged ≥15 years.
  • Adults are often the source of infection for infants too young to be fully vaccinated, making adult disease a public‑health concern.

Symptoms

Adults typically experience a three‑stage progression, but the classic “whoop” may be absent. Symptoms can last weeks to months.

1. Catarrhal stage (1‑2 weeks)

  • Low‑grade fever (often <38 °C/100.4 °F)
  • Runny nose, sneezing, mild sore throat
  • Occasional dry cough

2. Paroxysmal stage (2‑6 weeks, sometimes longer)

  • Severe coughing fits – may last 1‑2 minutes and occur several times a day.
  • Post‑cough “whoop” – a high‑pitched intake of breath; present in only 30‑40 % of adults.
  • Vomiting after coughing fits.
  • Facial flushing or bluish lips (due to brief oxygen shortage).
  • Exhaustion and difficulty sleeping.

3. Convalescent stage (weeks to months)

  • Cough becomes less severe but may persist for months (a “post‑pertussis cough”).
  • Episodes can be triggered by cold air, dust, or respiratory infections.

Because the cough can mimic bronchitis, asthma, or COPD exacerbations, a high index of suspicion is essential, especially when cough lasts >2 weeks and is accompanied by “whooping” or vomiting.

Causes and Risk Factors

Cause

Pertussis is caused by the gram‑negative bacterium Bordetella pertussis. The organism adheres to ciliated respiratory epithelium and releases toxins (pertussis toxin, tracheal cytotoxin, adenylate cyclase toxin) that damage airway cells, impair mucociliary clearance, and trigger intense cough reflexes.

Risk Factors in Adults

  • Incomplete or waning immunity – immunization with the DTaP/Tdap vaccine offers protection for ~4‑10 years; immunity declines over time.
  • Living or working in close‑contact settings (schools, nursing homes, military barracks).
  • Underlying lung disease (asthma, COPD, bronchiectasis).
  • Smoking or exposure to secondhand smoke, which impairs airway clearance.
  • Immunocompromise (HIV, organ transplant, chemotherapy).
  • Pregnancy – pregnant women are advised to receive Tdap in the third trimester to protect newborns.

Diagnosis

Timely diagnosis is crucial to limit spread and initiate treatment. Diagnosis combines clinical assessment with laboratory testing.

Clinical Evaluation

  • History of prolonged cough (>2 weeks) with paroxysms, post‑tussive vomiting, or inspiratory “whoop”.
  • Vaccination history and exposure to known cases.
  • Physical exam may reveal cough‑associated facial flushing, but lung sounds are often normal.

Laboratory Tests

  • PCR (polymerase chain reaction) on nasopharyngeal swab – most sensitive during the catarrhal and early paroxysmal stages; results available within 24‑48 h.
  • Culture – gold standard but less sensitive (50‑60 %) and takes 7‑10 days; still useful for antibiotic susceptibility.
  • Serology – measurement of anti‑pertussis toxin IgG; helpful >2 weeks after symptom onset when PCR may be negative.

Imaging

Chest X‑ray is not diagnostic for pertussis but may be ordered to rule out pneumonia or other causes of cough.

Treatment Options

Antibiotic Therapy

Antibiotics are most effective when started early (within the first 3 weeks of cough). They reduce bacterial load, shorten illness duration, and limit contagion.

  • Azithromycin 500 mg on day 1, then 250 mg daily for 4 days – preferred for adults because of once‑daily dosing and shorter course.
  • Clarithromycin 500 mg twice daily for 7 days – an alternative.
  • Trimethoprim‑sulfamethoxazole (TMP‑SMX) 160/800 mg twice daily for 14 days – used for macrolide‑resistant strains.

Even if started later, antibiotics are still recommended to reduce transmission.

Supportive Care

  • Hydration – coughing can cause vomiting and dehydration.
  • Analgesics/antipyretics (acetaminophen or ibuprofen) for fever or sore throat.
  • Humidified air or a cool‑mist vaporizer to soothe irritated airways.
  • Avoidance of irritants (smoke, strong odors, dust).

Adjunctive Measures

In severe cases, especially with hypoxia, hospitalization may be needed for oxygen therapy, bronchodilators, or intensive monitoring.

Living with Whooping Cough (Pertussis) in Adults

Recovery can be a marathon. Below are practical steps to manage daily life while the cough heals.

  • Schedule rest periods – cough bouts are exhausting; short naps between episodes help maintain energy.
  • Stay hydrated – sip water, electrolyte solutions, or warm herbal teas throughout the day.
  • Use cough‑relief techniques:
    • Place a rolled towel over the chest to provide gentle pressure during fits.
    • Practice diaphragmatic breathing after a coughing spell to restore normal rhythm.
  • Protect your voice – limit speaking during severe fits; communicate by writing or texting if needed.
  • Nutrition – opt for soft, easy‑to‑swallow foods (yogurt, smoothies, oatmeal) to prevent aggravating the throat.
  • Work considerations – inform your employer; many workplaces allow remote work or modified duties during the contagious period (first 5 days of antibiotics).
  • Vaccination reminder – if you have not received a Tdap booster in the last 10 years, schedule it after you finish antibiotics (usually safe to give once you’re no longer febrile).

Prevention

  • Vaccination – A single dose of Tdap (tetanus, diphtheria, acellular pertussis) is recommended for:
    • Adults who have never received pertussis vaccine.
    • Pregnant women at 27‑36 weeks gestation each pregnancy.
    • Close contacts of infants (parents, grandparents, caregivers).
  • Good respiratory hygiene – cover mouth/nose with a tissue or elbow, dispose of tissues, wash hands frequently.
  • Avoid sharing utensils or close face‑to‑face contact with anyone who has a lingering cough.
  • Stay home while contagious – usually the first 5 days of appropriate antibiotic therapy.
  • Boost overall immunity – balanced diet, regular exercise, adequate sleep, and smoking cessation.

Complications

If untreated or severe, pertussis can lead to:

  • Secondary bacterial pneumonia – the most common cause of pertussis‑related death in adults.
  • Rib fractures or chest wall bruising from violent coughing.
  • Herniation of abdominal muscles or lumbar spine.
  • Syncope (fainting) due to prolonged cough episodes.
  • Weight loss, malnutrition, and dehydration.
  • Exacerbation of underlying chronic lung disease (asthma, COPD).
  • In rare cases, seizures or encephalopathy from hypoxia.

When to Seek Emergency Care

Call 911 or go to the nearest emergency department if you experience any of the following:
  • Difficulty breathing or shortness of breath that does not improve with rest.
  • Bluish lips, fingertips, or face (sign of low oxygen).
  • Chest pain that is sharp, persistent, or worsens with coughing.
  • Vomiting blood or coughing up blood.
  • Severe, unrelenting vomiting leading to dehydration.
  • Sudden loss of consciousness or fainting.
  • High fever (>39.5 °C/103 °F) that does not respond to acetaminophen or ibuprofen.

These signs may indicate a complication such as pneumonia, airway obstruction, or severe hypoxia, all of which require immediate medical attention.

References

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⚠️ Medical Disclaimer

Important: The information provided on this page is for general informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

If you think you may have a medical emergency, call your doctor, go to the emergency department, or call 911 immediately.

📚 Medical References