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If the laryngitis is from a viral or bacterial infection, it is possible that the specific virus or bacteria can be contagious. However, if the laryngitis is from laryngeal cancer or overuse of the voice, it is not contagious.f the laryngitis is from a viral or bacterial infection, it is possible that the specific virus or bacteria can be contagious. However, if the laryngitis is from laryngeal cancer or overuse of the voice, it is not contagious.
Causes of acute laryngitis include: 1  Viral infections similar to those that cause a cold. 2  Vocal strain, caused by yelling or overusing your voice. 3  Bacterial infections, such as diphtheria, although this is rare, in large part due to increasing rates of vaccination.