[tz] Descriptions of the various medications
sergeywmasters at gmail.com
Wed Sep 19 05:19:11 UTC 2012
There are many viral diseases. Let's talk about the most common ones. Let's
start with the flu virus. There are many laboratories around the world who
regularly completion of stockpile vaccines and drugs to treat it.
The influenza virus is most studied infectious agents. It should be noted
that the epidemic virus Grip occur every year, and every few decades the
epidemic of influenza is becoming a pandemic.
The influenza virus has the ability to quickly change their structure.
These changes affect the surface
proteins - antigens, which recognizes the human immune system. Immunity of
a man who developed a
in contact with a variety of virus is not able to recognize the other, and
when she begins her infection
recognize only after full development of the disease.
Antigenic variation is the ability of the virus to change its structure. It
is because of her flu occur regularly. This regularity is alien to other
infections, and only because of it being infected with influenza most
people. Antigenic variation is of two kinds. First - antigenic drift, the
second - antigenic shift.
Antigenic drift - it mutations affecting two major viral proteins -
hemagglutinin (H), which provides
introduction of the pathogen in human cells, and neuraminidase (N), which
is responsible for the output of mutated viruses from the cell.
The emergence of antigenic drift is due to the fact that the enzyme, which
doubles the viral RNA in
the process of creating new viruses, no function of protection against
errors that occur during the synthesis. These errors and lead to a mutation
of the pathogen.
The very same process of antigenic drift leads to a gradual change in the
structure of the influenza virus, which causes it to partial or complete
neuznavaniyu human immune system. It is for this reason there is a need
systematically change the antigens included in the flu vaccine.
Antigenic shifts - are the most significant changes in the antigenic
composition of the virus. Promotes
emergence antegennyh shifts that influenza can affect not only human cells,
but also of animals: pigs,
horses, birds, etc. In cases where the body there is more than one species
of the virus, is the exchange of entire genes between viruses, thereby
producing new strains of influenza, which in most cases are more aggressive
than the original ones. This process and called antigenic shift.
Now a wide range of antiviral drugs that you can to *buy* in our *online
pharmacy <http://superpills.blogspot.com/>*. The best effect of these drugs
is achieved in situations where they are beginning to use when detecting
the first symptoms of influenza infection, but they are also able to
facilitate the course of the disease at any stage.
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