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Although the viruses that cause laryngitis, such as the common cold virus, are contagious and can be passed from person to person, usually the contagious period for the common cold is earlier on in the infection, before symptoms begin and when the cough and congestion symptoms are at their height.lso mechanical strain (singing or talking) are common non infectious causes of laryngitis. Obviously, mechanical laryngitis is not infectious or contagious. Viral laryngitis, which is the next most common form, is also not usually contagious.
Infections from germs are a very common cause of laryngitis â in kids as well as adults. Sometimes bacteria can infect the vocal cords, but most of the time it's viruses â like those that cause runny noses or flu-like illnesses. That's why sometimes when you have a cold or a bad cough, your voice also sounds funny.