What are the warning signs of whooping cough?

Warning signs and early symptoms of whooping cough, or pertussis, include a mild, occasional cough, runny nose, low-grade fever and apnea, according to the U.S. Centers for Disease Control and Prevention. Early symptoms often persist for up to two weeks.

Whooping cough, known as the 100-day cough in China, causes coughing fits that persist for as long as 10 weeks, notes the CDC. Many people with whooping cough feel fine in between fits of coughing. Respiratory infections often complicate recovery from whooping cough. Pertussis received its whooping cough moniker due to the whooping sound often made by people suffering from the condition.