Pertussis serology refers to the laboratory testing of blood samples to detect antibodies against Bordetella pertussis, the bacterium responsible for whooping cough. This testing is crucial in diagnosing recent or past infections, especially in cases where clinical symptoms are atypical or vaccination history is unclear. A key association is that infants are at high risk for severe complications, such as pneumonia or seizures, making timely diagnosis essential for effective management.

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