Which of the following is a common symptom of whooping cough?

A runny nose is a common symptom of whooping cough, particularly in the early stages of the infection. Whooping cough, caused by the bacterium Bordetella pertussis, typically presents initially with mild respiratory symptoms. These initial symptoms, often resembling a cold, can include a runny nose, sneezing, and mild cough. As the disease progresses, it may lead to more severe symptoms such as intense coughing fits that can be followed by a distinctive "whooping" sound when the person breathes in.

The presence of a runny nose at the onset helps differentiate whooping cough from some other respiratory illnesses, making it a key indicator in the early identification of the disease. Awareness of this symptom is crucial for prompt diagnosis and treatment to reduce the risk of complications and limit the spread of infection, especially considering the highly contagious nature of whooping cough.