Viruses can be very dangerous for humans

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Viruses can be very dangerous for humans

Healthyandhealth healthyandhealth Viruses can be very dangerous for humans 6283673 79848629

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[healthy and health]Once a virus infects a cell, it tries to take over its host completely, much as Napoleon spread the French influence with every country he fought. A infected lodged in a cell replicates and reproduces as much as possible; with each new replication, the host cell produces more viral material than it does normal genetic material. Left unchecked,it will cause the death of the host cell. These will also spread to nearby cells and begin the process again.

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The human body does have some natural defenses against a virus. A cell can initiate RNA interference when it detects viral infection, which works by decreasing the influence of the virus’s genetic material in relation to the cell’s usual material. The immune system also kicks into gear when it identifies this by producing antibodies that bind to the it and render it unable to replicate. The immune system also releases T-cells, which work to kill the it. Antibiotics have no effect on viruses, though vaccinations will provide immunity.

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Unfortunately for humans, some viral infections outpace the immune system. These can evolve much more quickly than the immune system can, which gives them a leg up in uninterrupted reproduction. And some viruses, such as HIV, work essentially by tricking the immune system. Some of these cause many diseases, including colds, measles, chicken pox, HPV, herpes, rabies, SARS and the flu.

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Common human diseases caused by viruses include the common cold, the flu, chickenpox and cold sores. Serious diseases such as Ebola and AIDS are also caused by viruses. Many viruses cause little or no disease and are said to be “benign”. The more harmful viruses are described as virulent. Viruses cause different diseases depending on the types of cell that they infect. Some viruses can cause lifelong or chronic infections where the viruses continue to reproduce in the body despite the host’s defence mechanisms.This is common in hepatitis B  and hepatitis C virus infections. People chronically infected with this are known as carriers. They serve as important reservoirs of this. If there is a high proportion of carriers in a given population, a disease is said to be endemic.

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There are many ways in which viruses spread from host to host but each species of virus uses only one or two. Many viruses that infect plants are carried by organisms; such organisms are called vectors. Some viruses that infect animals, including humans, are also spread by vectors, usually blood-sucking insects. However, direct transmission is more common. And some,such as rotavirus, are spread by contaminated food and water, hands and communal objects and by intimate contact with another infected person, while others are airborne (influenza).Viruses such as HIV, hepatitis B and hepatitis C are often transmitted by transfusion of blood.

It is important to know how each different kind of virus is spread to prevent infections and epidemics.

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1 Comment

  1. kingboy says:

    Goof info i like it

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