Laboratory diagnosis of whooping cough

A clinician may collect material from the back of the nose with a thin swab. A molecular test can look for pertussis genetic material and often works best earlier in the illness. A culture may grow the bacteria from a respiratory sample, but it can take longer and becomes less useful as time passes or after antibiotics.

Blood antibody testing may be considered later in the cough, depending on age, timing, and local laboratory practice. A negative result does not always exclude whooping cough: the sample, test method, stage of illness, and recent antibiotic treatment can affect detection. The pattern of coughing, exposure history, and examination findings remain part of the clinical assessment.

Follow the sampling instructions carefully and tell the clinician when the cough began, whether coughing fits cause vomiting, and whether you have started antibiotics. Limit close contact with babies, pregnant people, and anyone with a weakened immune system until a clinician advises you about contagiousness.

If whooping cough is suspected, a clinician may recommend Antibiotic Treatment before the laboratory result returns, particularly when someone vulnerable has been exposed. Antibiotics may reduce spread and are not a substitute for monitoring breathing. Drink fluids, rest, and use only cough medicines that a healthcare professional considers suitable for your age and circumstances.

Get urgent help for pauses in breathing, blue or grey lips, struggling to breathe, severe drowsiness, dehydration, or repeated vomiting that prevents drinking. Infants may have breathing pauses with little or no cough. A worsening cough, persistent fever, or poor feeding also deserves prompt clinical advice, especially in a young child.

Ask which test was taken, whether its timing fits the start of the cough, and when the result is expected. Ask whether household contacts need assessment or preventive advice, how long to avoid close contact, and whether Childhood Immunisation is up to date for children in the home.