WHO describes pertussis, or whooping cough, as a highly contagious bacterial respiratory infection that can be especially dangerous for infants.
What the official source says
Pertussis spreads through respiratory droplets. Early illness may resemble a common cold, then repeated coughing fits can develop. The characteristic whoop is not present in every child; young infants may have pauses in breathing rather than a dramatic cough.
Infants too young to have completed their vaccine series have the greatest risk of severe disease. Vaccination reduces risk and severity but protection can decrease over time, which is why schedules include several doses and may include vaccination during pregnancy.
This article translates the linked public-health source into a practical reading resource for families. It does not add a diagnosis, promise an outcome or replace local clinical guidance. The meaning of a symptom depends on the child’s age, medical history, exposures, duration of illness and overall condition.
What a parent or caregiver may notice
- runny nose, mild fever and early cough
- repeated or violent coughing fits
- vomiting or exhaustion after coughing
- pauses in breathing, blue colour or poor feeding in infants
These features are clues rather than a home diagnosis. Common childhood problems can produce similar symptoms, while an important condition can begin with mild or incomplete signs. Notice the pattern: when it began, whether it is getting better or worse, how the child is breathing and drinking, urine output, alertness, pain, fever and any relevant exposure.
How risk or exposure can arise
- close contact with a coughing household member
- missing or delayed recommended vaccine doses
- waning immunity in older children or adults
- crowded indoor contact during an outbreak
Risk is not certainty. It helps a clinician or public-health team decide what questions, examination or tests may be useful. Families should mention recent travel, illness in close contacts, animal or water exposure, medicines, vaccination history, existing conditions and any public-health alert that fits the situation.
Practical prevention and care steps
- keep routine pertussis vaccination up to date
- follow local guidance for vaccination during pregnancy
- seek early advice after a close confirmed exposure
- use cough hygiene and keep an infectious person away from infants
Choose steps that match the child’s age and local advice. Avoid using antibiotics, supplements, restrictive diets or prescription medicines without the right assessment. If a clinician has already provided a written plan, follow that plan and ask for clarification when the child’s symptoms no longer fit it.
Good records make care easier. Keep vaccination and medication details together, write down temperatures or symptom times when relevant, and note what the child can drink, eat and do compared with usual. For a contagious illness, ask when the child can safely return to school or childcare rather than relying only on whether a rash or fever has disappeared.
When to seek urgent medical help
- any pause in breathing or blue colour
- feeding failure, dehydration or marked exhaustion
- a young infant with significant cough or known exposure
Seek urgent help whenever a child is rapidly worsening, has trouble breathing, is difficult to wake, has a seizure, shows signs of severe dehydration, or when a parent feels the child is seriously unwell. Young infants and children with immune, heart, lung, blood or neurologic conditions may need assessment earlier. Use local emergency services when delay could be dangerous.
Questions to take to a healthcare visit
- Which features in this child support or argue against the suspected problem?
- Is testing needed now, later, or only if symptoms persist?
- What fluids, food, activity and medicines are appropriate today?
- Which exact change should trigger urgent reassessment?
- Are household members, school contacts or public-health services affected?
Bring a timeline and a list of medicines, allergies and underlying conditions. If safe and useful, a photograph of a changing rash or a brief video of an unusual movement or breathing pattern can help show what happened outside the clinic. Never delay emergency care to make a recording.
Keeping the information in perspective
A whoop is not required for pertussis. Testing, antibiotics and preventive treatment for contacts must be decided promptly by a clinician.
The official source describes populations and public-health priorities; it cannot predict one child’s course. Local disease patterns, vaccination schedules, available tests and treatment pathways differ. A paediatrician or other qualified professional can apply the evidence to the individual child and update advice as the situation changes.