Everyone coughs from time to time. It can be just a once-off effort to clear the air passages or, on the other end of the scale, a chronic cough lasting for months.
When you cough, you expel tiny drops of water into the air. If you have a throat or lung disease, the germs that caused the illness will be present in these droplets.
If other people breathe in these germs, they may catch the disease. This happens especially in the case of colds and flu.
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