You can.
Repeated exposure to viruses causing colds creates partial immunity.
Viruses can remain dormant in a cell until conditions become favorable for replication. Factors such as a weakened immune system or stress can trigger the virus to become active again.
Bacteria are one of the simplest organisms, a little evolved from viruses and just like viruses, they can also mutate and become resistant to human medicines.
the viruses help the immune system adapt and get stronger
Most viruses do not affect the ability of a person to become pregnant. Some viruses might weaken your immune system or make you less likely to have an interest in sex, but there are few if any viruses which would prevent your getting pregnant.
Body has got immune system. This immune system or the body immunity forms the antibodies to fight the viruses. The immunity against the viruses is usually life long.
The organs of the immune system fight viruses and bacteria.
white blood cells
No. Viruses are not living things, so they do not have an immune system. In a way, however, they can protect themselves from us by mutating their own form so that our immune system can not recognize them any more. Until our bodies learn again that they are a foreign invader in our cells and then create new cells that can destroy the new mutation of the virus, it does have a chance to safely be in our bodies. While in our cells, a virus makes our cells do its main function (which is replication of itself). The mutation that it does by changing the make up of the proteins on its capsid (outer shell) allows it to bypass our immune systems temporarily.
Viruses multiplying from a host cell
Flu viruses that people are not immune to.
viruses, diseases