Why viruses be removed from the host?

There are several reasons why viruses may be removed from the host. Here are some of the most common:

1. Immunity: The host's immune system may recognize the virus as foreign and mount an immune response against it. This response can lead to the production of antibodies that can neutralize the virus and prevent it from infecting healthy cells.

2. Antiviral drugs: Antiviral drugs are medications that are specifically designed to inhibit the replication of viruses. These drugs can be used to treat viral infections and help to reduce the severity of symptoms.

3. Interferon: Interferon is a protein that is produced by the host in response to viral infection. Interferon can inhibit the replication of viruses and help to protect healthy cells from infection.

4. Heat: Viruses can be destroyed by heat. This is why many methods of food preparation, such as cooking and boiling, are effective at killing viruses.

5. Ultraviolet (UV) light: UV light can also destroy viruses. This is why UV light is often used to disinfect surfaces and equipment in hospitals and other healthcare settings.

6. Lysosomes: Lysosomes are small membrane-bound organelles found in the cytoplasm of animal cells. They contain enzymes that can break down macromolecules. Lysosomes can fuse with viruses and degrade them.

7. Excretion: Viruses can also be removed from the host through excretion. This can occur through the respiratory tract, the digestive tract, or the urinary tract.