A study conducted at the University of Georgia Poultry Diagnostic and Research Center and funded by the U.S. Poultry and Egg Association has revealed new insights into infectious laryngotracheitis (ILT).
The study found that combination live Newcastle disease and infectious bronchitis vaccines interfered with the immunity produced by tissue-culture-origin ILT. Both tissue-culture- and chick-embryo-origin ILT vaccines depressed antibody response to infectious bronchitis and Newcastle disease, suggesting mutual interference.
The ILT virus designated strain 63140 persists in the trachea longer than a U.S. Department of Agriculture standard challenge strain. The incubation period for the prevalent North Georgia field strain is only two to three days. There is a high degree of correlation between antibody title level against ILT and the geographic distribution of the infection in North Georgia. Protection is adversely affected when dilution of vaccine viruses is carried out.
The emergence of strain GA63140 ILT has resulted in significant losses in the regional broiler industry. Health professionals involved with egg production flocks should be aware of the variants of this strain, which require diligent application of chick-embryo-origin vaccine. The protective ability of ILT vector vaccine has yet to be determined.
Showing posts with label ILT. Show all posts
Showing posts with label ILT. Show all posts
Tuesday, March 30, 2010
Monday, March 23, 2009
Virus prompts killing 1.4M chickens in Texas
More than 1.4 million chickens have been killed in Robertson County, Texas; last week after officials detected a rare respiratory infection in some of the birds.
Lampkin Butts, chief operating officer of Mississippi-based Sanderson Farms, said March 19 that chickens with infectious laryngotracheitis, or ILT, were found on farms in Texas more than a week ago. It is unclear how the birds became infected.
The virus is not a danger to people, even if they eat meat infected with the disease, according to Texas Animal Health Commission (TAHC) officials who are overseeing the slaughter of the birds in Robertson County.
Butts said about a million of those killed would be processed for food and that meat from another 400,000 euthanized birds would not be distributed.
Lampkin Butts, chief operating officer of Mississippi-based Sanderson Farms, said March 19 that chickens with infectious laryngotracheitis, or ILT, were found on farms in Texas more than a week ago. It is unclear how the birds became infected.
The virus is not a danger to people, even if they eat meat infected with the disease, according to Texas Animal Health Commission (TAHC) officials who are overseeing the slaughter of the birds in Robertson County.
Butts said about a million of those killed would be processed for food and that meat from another 400,000 euthanized birds would not be distributed.
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