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Suddenly, also known as Suddenly, Suddenly, Coughing, Suffering from Coughing, Coughing, and Coughing. Is one of the common respiratory infections in childhood. In the early stages of the onset, there is a table cold or Wei sub-card first, and then there is paroxysmal spasm cough. At the end of the cough, there is often a special inspiratory roar. If not treated in time, the course of the disease can be delayed until March or April, so it is also known as pertussis.