Question

How many Viruses are present in the human body?

Answer 1

Viruses are mostly infectious agents. Viruses need to occupy host cells in order to reproduce, and they adapt themselves at exploiting all the organs in the body. Outside the host's body, viruses are nothing but non-living things.

Complete answer:
It has been evaluated that there are around 380 trillion viruses present inside us, that are altogether called the human virome. These viruses are not the infectious ones that usually cause diseases like those that cause the flu or the common cold, or more dangerous infections like Ebola or dengue. Many of these viruses affect and cause infection in the bacteria that live inside the body and are known as bacteriophages. The human body is a breeding ground for phages, and in spite of their ample number, our body has very little knowledge into what any of the viruses in the body are doing.
A decade ago, researchers did not even know that the human virome existed. Today we see the huge virome as an important part of the larger human microbiome. Scientists have been mapping the virome for 10 years, and the deeper investigation goes, the more the virome looks like a relationship that can influence our daily lives positively and negatively. Recent research proves that we could even get the virome to promote our own health.
There are both good and bad viruses that can affect our health. Bad ones can really make us sick and even can cause death in some cases. We need to be very sure as to which type of viruses are inhabiting our body.

Note:
The human body is a rich environment for microbes that are useful and help us with many different processes. Many viruses have figured out how to peacefully live in it without making us sick. The important task is to figure out which ones are helpful and which ones are bad for our health.