Respuesta :

Here is your answer:

1. Influenza
2. Rhinovirus
3. lentivirus

Reason: Viruses are caused by sickness which could often cause death if not treated or no medication.
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Human Immunodeficiency Virus (HIV): This is HIV, the virus that causes AIDS.

Flu Viruses: There are a lots of different strains of flu viruses, which is why new vaccines have to be made every year.

Cold Viruses: The common cold is caused by a virus. 

Hope this helped :)

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