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Signs and Symptoms

Español: Signos y síntomas

Pertussis (whooping cough) can cause serious illness in babies, children, teens, and adults. Symptoms of pertussis usually develop within 5 to 10 days after being exposed, but sometimes not for as long as 3 weeks.

Early Symptoms

In those who have been vaccinated:

  • In most cases, the cough won’t last as many days
  • Coughing fits, whooping, and vomiting after coughing fits occur less often
  • The percentage of children with apnea (long pause in breathing), cyanosis (blue/purplish skin coloration due to lack of oxygen) and vomiting is less

The disease usually starts with cold-like symptoms and maybe a mild cough or fever. In babies, the cough can be minimal or not even there. Babies may have a symptom known as "apnea." Apnea is a pause in the child's breathing pattern. Pertussis is most dangerous for babies. About half of babies younger than 1 year who get the disease need care in the hospital. Learn more about pertussis complications.

Early symptoms can last for 1 to 2 weeks and usually include:

  • Runny nose
  • Low-grade fever (generally minimal throughout the course of the disease)
  • Mild, occasional cough
  • Apnea – a pause in breathing (in babies)

Because pertussis in its early stages appears to be nothing more than the common cold, it is often not suspected or diagnosed until the more severe symptoms appear.

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Pertussis in Babies

It is important to know that many babies with pertussis don’t cough at all. Instead it causes them to stop breathing and turn blue.

Later-stage Symptoms

After 1 to 2 weeks and as the disease progresses, the traditional symptoms of pertussis may appear and include:

  • Paroxysms (fits) of many, rapid coughs followed by a high-pitched "whoop"
  • Vomiting (throwing up) during or after coughing fits
  • Exhaustion (very tired) after coughing fits

Pertussis can cause violent and rapid coughing, over and over, until the air is gone from the lungs and you are forced to inhale with a loud "whooping" sound. This extreme coughing can cause you to throw up and be very tired. Although you are often exhausted after a coughing fit, you usually appear fairly well in-between. Coughing fits generally become more common and bad as the illness continues, and can occur more often at night. The coughing fits can go on for up to 10 weeks or more. In China, pertussis is known as the "100 day cough." However, the "whoop" is often not there for people who have milder (less serious) disease. The infection is generally milder in teens and adults, especially those who have been vaccinated.

pertussis timeline

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Would You Know Pertussis?

Boy coughing

Hear how the cough may sound
It is important to know that not everyone with pertussis coughs or "whoops".


Recovery from pertussis can happen slowly. The cough becomes milder and less common. However, coughing fits can return with other respiratory infections for many months after the pertussis infection started.


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