Infectious bursal disease

（重定向自IBDV）

Enlarged bursa of Fabricius with yellowish peribursal oedema

Infectious bursal disease (also known as IBD, Gumboro Disease, Infectious Bursitis and Infectious Avian Nephrosis) is a highly contagious disease of young chickens caused by infectious bursal disease virus (IBDV), characterized by immunosuppression and mortality generally at 3 to 6 weeks of age. The disease was first discovered in Gumboro, Delaware in 1962. It is economically important to the poultry industry worldwide due to increased susceptibility to other diseases and negative interference with effective vaccination. In recent years, very virulent strains of IBDV (vvIBDV), causing severe mortality in chicken, have emerged in Europe, Latin America, South-East Asia, Africa and the Middle East. Infection is via the oro-fecal route, with affected bird excreting high levels of the virus for approximately 2 weeks after infection.

单词	IBDV
释义	IBDV 英语百科 Infectious bursal disease （重定向自IBDV） Infectious bursal disease (also known as IBD, Gumboro Disease, Infectious Bursitis and Infectious Avian Nephrosis) is a highly contagious disease of young chickens caused by infectious bursal disease virus (IBDV), characterized by immunosuppression and mortality generally at 3 to 6 weeks of age. The disease was first discovered in Gumboro, Delaware in 1962. It is economically important to the poultry industry worldwide due to increased susceptibility to other diseases and negative interference with effective vaccination. In recent years, very virulent strains of IBDV (vvIBDV), causing severe mortality in chicken, have emerged in Europe, Latin America, South-East Asia, Africa and the Middle East. Infection is via the oro-fecal route, with affected bird excreting high levels of the virus for approximately 2 weeks after infection.
随便看	load extension curve的意思 loadextension curve的意思 load face的意思 load facility的意思 loadfactor的意思 load factor的意思 load factor design method of bridge的意思 load factor meter的意思 load factor of a unit的意思 load factor of container的意思 load factor of intersection的意思 load factor of nuclear power plant的意思 load factor passenger的意思 load factor pricing的意思 load factor rate的意思 load factor rating的意思 load factor ratio的意思 load factor的意思 load factor system的意思 load factor tonnage的意思 load feeder的意思 Load file的意思 load file instruction的意思 loadfix的意思 loadfloor的意思