Whooping Cough Symptoms in Adults

Whooping cough is not just a childhood illness. Adult cases are common, frequently undiagnosed, and are a major route by which infants become infected. Immunity from childhood vaccination fades over time, leaving most adults susceptible.

The three stages

Stage 1: Cold-like (1–2 weeks)

Runny nose, mild cough, low or no fever, occasionally watery eyes. Indistinguishable from a common cold. This is when you are most contagious and least likely to suspect anything.

Stage 2: Coughing fits (2–6 weeks, sometimes longer)

This is the distinctive phase. Sudden, violent bursts of coughing — often ten or more coughs in a row without a breath in between. Between fits, you may feel completely normal.

Features of the fits:

• Often worse at night
• May end in vomiting — a strong clue
• Can cause fainting or a cracked rib from the force
• Leave you exhausted and gasping
• Triggered by talking, laughing, eating, or cold air

The characteristic “whoop” sound comes from drawing breath in through a narrowed airway after a fit. Most adults never whoop. Its absence does not rule out the diagnosis.

Stage 3: Recovery (weeks to months)

Fits become less frequent and less severe but can continue for months, which is why it is known in some countries as the hundred day cough. Coughing can return with subsequent respiratory infections for up to a year.

Clues that point to whooping cough

• A cough lasting more than two weeks with no fever
• Coughing that comes in distinct fits rather than continuously
• Vomiting after coughing
• Feeling fine between fits
• A cough much worse at night
• Known exposure to someone with a prolonged cough
• Cracked or bruised ribs from coughing

The pattern — paroxysms with normal intervals — is what separates it from the steady cough of a post-viral cough or bronchitis.

Testing

A PCR test on a nasal swab is the standard method and is most accurate in the first three to four weeks of symptoms. After that, sensitivity drops considerably and blood antibody testing may be used instead.

This timing matters: if you have been coughing for two months, testing may not confirm it. Many cases are diagnosed clinically based on the pattern.

Treatment

Antibiotics — usually azithromycin — are given, but with an important caveat. They are most effective in the first one to two weeks. Started later, they do little for your symptoms because the damage to the airway lining is already done.

The main reason to treat later cases is to stop you infecting others. You are generally considered non-contagious after five days of appropriate antibiotics, or after three weeks of coughing if untreated.

Beyond antibiotics, treatment is supportive. Cough medicines are largely ineffective for whooping cough. Small frequent meals help reduce post-cough vomiting. A quiet, humidified environment reduces triggers.

Why adult cases matter

Infants under six months are at highest risk of severe complications and death from whooping cough, and they are usually infected by an adult in the household — often a parent or grandparent with an undiagnosed cough.

If you have a prolonged coughing illness, stay away from infants until you have been evaluated.

Vaccination

The Tdap vaccine protects against tetanus, diphtheria, and pertussis. Current US guidance includes:

• One Tdap dose for adults who have not previously had one
• A Tdap dose during every pregnancy, typically between 27 and 36 weeks, to pass protection to the newborn
• A Td or Tdap booster every 10 years

Anyone who will be in close contact with a newborn should be up to date. Check current CDC guidance or ask your pharmacist, as recommendations are periodically revised.

Complications to watch for

Rib fractures, hernias, fainting, incontinence, and secondary pneumonia. Seek care for breathlessness, chest pain, high fever, or coughing up blood. See when a cough needs a doctor.

Related reading

• Post-Viral Cough That Will Not Go Away: Why It Happens
• Bronchitis vs Pneumonia: How to Tell the Difference
• When Does a Cough Need a Doctor? Red Flag Checklist

Sources

• Centers for Disease Control and Prevention
• MedlinePlus — U.S. National Library of Medicine
• Drug Information — MedlinePlus