This is called antigenic "drift." This process allows the virus to make a more stable change yet still evade the immune system. The second type of change is an abrupt change in the hemagglutinin and/or the neuraminidase proteins. This is called antigenic "shift." It isn't as stable of a change but if it does make a successful and complete mutation it can become so deadly that another pandemic... displayed 300 characters
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Although Type A viruses undergo both types of changes, Type B only go through the more gradual Type B.
Antigenic shift occurs only occasionally, but when it does large numbers of people or even entire populations have no antibody against the virus. Although this is potentially lethal, the virus can only start a pandemic if it is able to be spread easily... displayed next 300 characters
This is called antigenic "shift." In this case, a new subtype of the virus suddenly emerges. Type A viruses undergo both kinds of changes; influenza type B viruses change only by the more gradual process of antigenic drift and therefore do not cause pandemics...
Scientists put out most of their effort to control influenza A and B because of their huge impact on the nation and the world. Influenza type A viruses have two proteins that determine their specific type...
AIDS(Acquired Immune Deficiency Syndrome) is a deadly disease for which
there is no cure. This disease was first recognized in the mid 1980's. The
cause of AIDS is the HIV virus, and is most commonly spread by venereal routes
or exposure to contaminated blood or blood products...
After becoming infected with the HiV virus either by sexual activity, blood and blood products, needle sharing, mother to fetus, stage one begins. For the 4 to 8 weeks after being infected, the person may experience general flu-like symptoms...
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