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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.
You get immunity to the infection. Next time you get the infection by the same bacteria, your body can fight back the infection rather effectively. But the immunity does not last for life time, like most of the virus infections.
Artificial active immunity. Artificial because it is due to vaccination. Active because the body is stimulated by the vaccine to produce antibodies against Hepatitis B virus antigen.
If someone has already been infected with chickenpox, they are immune to it. Vaccines are also available. You have immune system in your body. This system recognizes the 'Foreign protein' that has entered in your body in the form of infection. It give rise to cell mediated and humeral immunity against the various infections, once you catch the same. Immunity against the virus infection is usually life long as against the bacterial infections. You get immunity to chickenpox by way of immunization. You can get passive immunity by injecting the chickenpox immunoglobins. Thirdly you can get the immunity by catching the disease by deliberate exposure of the child to chickenpox patient. After the attack of chickenpox you have immunity against the virus.
You cannot cure mono. Only your body can fight off the virus. The Epstein-Barr virus is a strain of the herpes virus, so it stays in your body for the rest of your life.
Disregard females, aquire currency
If you had no white cells - you would have no immunity to infections and diseases. Your life-expectancy would be almost zero !
Antibiotics
Being a Hepatitis C carrier means that at some point, the person was infected with the virus and it stays in their body for life.
You cannot get chickenpox twice. Your body adapts to the virus and you no longer break out. You can, however, get shingles later in life from the chickenpox virus still in your body.
It depends on the type of vaccine. A flu shot is needed every year because different strains of the virus become more prevalent. But a vaccine for HPV protects a woman for the rest of her life.
yes virus have life but only in the host cell