Answer:
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Cytomegalovirus is a large herpes virus infecting people in all ages and can cause variety of disease. Once a person is infected by it, the virus stays in the body for life and usually reactivates. This causes problems in people with weak immune system and with babies that are already infected even before they are born.
The first thing you <em>should</em> do is to report it to a trusted adult or authority figure whether that be their or your parents, or the school counselor/resource officer.
However, after you do that, you can try to care for them and comfort them as much as you can. It is recommended that you don't give them overbearing care as that can cause them to feel worse about themselves. If they do begin to hurt themselves, tell an adult.
Here is the National Suicide Prevention Lifeline: 1-800-273-8255
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