Whooping cough is most contagious in the first 2 weeks after the onset of the disease, especially in the first week after the onset of the disease. Pertussis is a respiratory infectious disease caused by Bordetella pertussis infection, highly contagious, pertussis patients are the only source of infection, in the incubation period at the end of the beginning of the beginning of the contagious, after the onset of the first 2 weeks of contagiousness is the strongest, so when the child is diagnosed with whooping cough, to do a good job of isolation measures, to avoid the other children are infected. Children infected with Bordetella pertussis, early manifestations of fever, nasal congestion, runny nose symptoms, and then spasmodic cough, accompanied by chicken-like roar at the end of the cough, severe cases may be complicated by pneumonia, encephalitis and other complications, so when the child has symptoms of pertussis, we should take the child to the hospital pediatrics in a timely manner to give a clear diagnosis of the targeted intervention in a timely manner.