The bird flu 刘真 北京师范大学生命科学学院 2005-10-24

What’s BIRD FLU? Avian influenza influenza A virus(H5N1 strain) Mutation-----human

Etiology

Brief Overview of Life Cycle

Bird Flu, a Threat to Human Health 1918-19 Spanish flu 1957-58 Asian flu 1968-69 Hong Kong flu 1997 Hong Kong flu NOWWWW……

Where are the birds flying to?

effective vaccines and antiviral drugs ? waiting……

To lessen your risk of becoming infected with bird flu: Avoid contact with live chickens and ducks - even ones that appear healthy. Avoid contact with dead birds. Avoid contact with items or surfaces that may have been contaminated with excrement from an infected bird. All foods from poultry, including eggs, should be thoroughly cooked. As with other infectious illnesses, one of the most important preventive practices is careful and frequent hand washing. Watch for symptoms such as a fever, difficulty breathing, cough, or any illness that requires prompt medical attention.

Thank you

Since December 2003, highly pathogenic H5N1 avian influenza viruses have swept through poultry populations across Asia and parts of Europe. The outbreaks are historically unprecedented in scale and geographical spread. Their economic impact on the agricultural sector of the affected countries has been large. From December 2003 to mid-July 2005, outbreaks of avian influenza A(H5N1) in poultry occurred in nine countries (Cambodia, China, Indonesia, Japan, the Republic of Korea, the Lao People's Democratic Republic, Malaysia, Thailand and Viet Nam). Since late July 2005, outbreaks in domestic poultry as well as wild birds have been reported in the Russian Federation, Kazakhstan and Mongolia. Outbreaks have recurred despite aggressive control measures, including the culling of more than 140 million poultry as of September 2005.

Human cases, with an overall fatality rate around 50%, have been reported in Cambodia, Indonesia, Thailand and Viet Nam. The majority of human infections occur sporadically. Increased infection of humans comes in winter months, November to March, with a smaller increase around July to September. Almost all human infections can be linked to contact with infected poultry, but isolated instances of inefficient human-to-human transmission may have occurred in Viet Nam in 2004, and possibly in Thailand and Indonesia.