katyzzzBird Flu and working
July 13th 2006 02:08
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Bird Flu : I have attached a diagram of the working of bird flu.
It's a highly infectious disease that has swept through bird populations in many parts of the world. In October of 2005, the disease reached Eastern Europe, most likely through migratory birds. It continued to spread through Europe, and in February of 2006 it moved into Africa. Although the virus does not infect humans easily, more than half of the people who have contracted it have died.
A virus particle -- or virion -- is a microscopic packet that contains genetic material wrapped in a layer of protein. Some viruses also have a lipid membrane around the protein coat. Unlike bacteria, they cannot reproduce on their own -- they have to invade host cells. This process destroys cells and makes people sick.
Influenza is a specific type of virus that attacks the respiratory system It can cause fevers, sore throats and congestion. If it attacks muscle cells, it can also cause muscle aches.
There are three types of influenza virus -- types A, B and C. Multiple subtypes exist within those types, and multiple strains exist within each subtype. Like many viruses, influenza can mutate through antigenic drift (small changes that occur as it reproduces) or antigenic shift (major changes that create a new subtype of the virus).
The influenza virus has eight gene segments. When two different types of influenza encounter each other, they can swap segments of their DNA. This can lead to new strains of the virus, some of which can be especially deadly. In fact, scientists believe that the two most recent flu pandemics occurred after human strains of influenza acquired genes from an avian flu virus.
Insert Caption Here
It's a highly infectious disease that has swept through bird populations in many parts of the world. In October of 2005, the disease reached Eastern Europe, most likely through migratory birds. It continued to spread through Europe, and in February of 2006 it moved into Africa. Although the virus does not infect humans easily, more than half of the people who have contracted it have died.
A virus particle -- or virion -- is a microscopic packet that contains genetic material wrapped in a layer of protein. Some viruses also have a lipid membrane around the protein coat. Unlike bacteria, they cannot reproduce on their own -- they have to invade host cells. This process destroys cells and makes people sick.
Influenza is a specific type of virus that attacks the respiratory system It can cause fevers, sore throats and congestion. If it attacks muscle cells, it can also cause muscle aches.
There are three types of influenza virus -- types A, B and C. Multiple subtypes exist within those types, and multiple strains exist within each subtype. Like many viruses, influenza can mutate through antigenic drift (small changes that occur as it reproduces) or antigenic shift (major changes that create a new subtype of the virus).
The influenza virus has eight gene segments. When two different types of influenza encounter each other, they can swap segments of their DNA. This can lead to new strains of the virus, some of which can be especially deadly. In fact, scientists believe that the two most recent flu pandemics occurred after human strains of influenza acquired genes from an avian flu virus.
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