Symptoms affecting quality of voice tend to worsen after speaking for long periods of time, or when speaking with increased volume. Many individuals who use their voice professionally find even a slight presence of symptoms to be problematic. However, some voice professionals are not impacted by the presence of vocal cysts. Vocal Dynamics
Vocal fold cysts cause the properties of the vocal folds to change. When a cyst is present on a vocal fold, the cover of the vocal fold becomes more stiff and increases in mass. The increased mass and stiffness tends to result in hyperkinetic muscular movement during phonation. Hyperkinetic movement is characterized by increased rigidity in the affected vocal fold(s). This hyperkinetic movement results in the voice being perceived as hoarse. (see Signs and Symptoms) Specifically, the presence of a vocal fold cyst leads to an asynchronous mucosal wave of the vocal folds during phonation. Causes
There are several possible causes of vocal fold cysts: 

They can be congenital. They can result from the blockage of a mucous glands excretory duct. In this case, they are sometimes referred to as retention cysts. They can be the result of phonotrauma. Phonotrauma refers to behaviours that can lead to vocal fold injuries, such as vocal overuse (i.e. too much speaking), vocal misuse (i.e. speaking in an unnaturally high or low pitch), or vocal abuse (i.e. yelling or whispering for prolonged periods). Vocal folds vibrate during phonation resulting in repeated collisions of the right and left vocal folds.
Herpes simplex virus and varicella-zoster virus infections are usually treated with acyclovir, whilst ganciclovir is used to treat cytomegalovirus. There is no known efficacious treatment for pneumonia caused by SARS coronavirus, MERS coronavirus, or hantavirus. Other forms of care are largely supportive like oxygen supplementation, treatment of comorbidities, and controlling other symptoms, fever and cough, with medications. Epidemiology
There are roughly 450 million cases of pneumonia every year. Of those case, viral pneumonia counts for about 200 million cases which includes about 100 million children and 100 million adults. Viral pneumonia is more prevalent in the very young, less than 5 years old, and in the very old, more than 75 years old. Developing countries have a higher rate of incidence when it comes to viral pneumonia. On average, developing countries have an incidence rate five times higher than that of developed countries. Being pregnant can also affect the chances of developing viral pneumonia. As with all infectious diseases, viral pneumonia preys on the immunocompromised as well as individuals with one or more comorbidities especially those with:

Trauma
Severe burns
Diabetes
Malnutrition
Poverty
Environmental Exposure
Group living

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