Срочно!! ! Помогите пожалуйста!! ! Нужно написать сочинение про грипп на английском языке (15 предложений)

Bird Flu

Bird flu is an infectious disease due to a type of influenza virus that is hosted by birds, but may infect several species of mammals. It was first identified in Serbia Montenegro in the early 1900s and is now known to exist worldwide.

A strain of the H5Nl-type of avian influenza virus that emerged in 1997 has been identified as the most likely source of a future influenza pandemic and is known to have infected 137 people in Asia since 2003, killing 70.

The avian influenza virus subtypes that have been confirmed in humane, ordered by the number of known human deaths, are: H1N1 caused Spanish flu, H2N2 caused Asian Flu, H3N2 caused Hong Kong Flu, H5N1, H7N7, H9N2, H7N2, H7N3.

In humane, bird flu viruses cause similar symptoms to other types of flu. These include fever, cough, sore throat, muscle aches, conjunctivitis and, in severe cases, severe breathing problems and pneumonia that may be fatal. The severity of the infection will depend to a large part on the state of the infected person's immune system and if the victim has been exposed to the strain before.

It is feared that if a strain of avian influenza virus to which humans have not been previously exposed undergoes aiitigenic shift to the point where it can cross the species barrier from birds to humans, the new subtype created could be both highly contagious-and highly lethal in humans. If a human infected with influenza virus also acquires H5N1, a mutant strain of bird flu that can be transmitted from human to human could form. Such a subtype could cause a global pandemic similar to the Spanish Flu that killed up to 50 million people in 1918.

Although avian influenza virus in humans can be detected with standard influenza virus tests, these tests have not always proved reliable. Currently the most reliable test requires use of the live virus to interact with antibodies from the patient's blood.

Antiviral drugs such as oseltamivir and zanamivir are sometimes effective in both preventing and treating the infection. Vaccines, however, take at least four months to produce and must be prepared for each subtype.

The World Health Organization (WHO) has warned of a substantial risk of an influenza epidemic in the near future, most probably from the H5N1 type of avian influenza virus. One of the primary concerns is that the virus could quickly spread across countries as various birds follow their migration routes. In response, countries have begun planning in anticipation of an outbreak.

While short-term strategies to deal with an outbreak focus on limiting travel and culling migrating birds and vaccinating poultry, long-term strategies require substantial changes in the lifestyles of the most at-risk populations.

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