Poultry and duck diseases-avian infectous bronchitis (ib), Biology

Avian infectous bronchitis (IB)

IB virus is caused by Infectious bronchitis virus of the genus Coronavirus in the family Coronaviridae, which is a positive sense ssRNA virus. It occurs in many antigenic variants as a consequence of mutations in its large genome.

IB virus spreads between birds by aerosol and by ingestion of food contaminated with feces.

Clinical signs: This is an acute, rapidly spreading disease of young chicks, chiefly under 4 weeks of age. Occasionally, older birds are attacked in mild form. Mortality is very high among young birds. Fowls are the only known species of birds susceptible to this disease. The symptoms include gasping, coughing and crackling breathing, watery discharge from the nose, sometimes with a swelling of the sinuses. The course of the disease may be rapid with most of the birds contracting the infection and recovering within a week or 10 days, or it may persist for as long as 3 weeks. Laying of poor quality eggs having weak shell and abnormal shape may persist for several weeks in layers.

Diagnosis: It is diagnosed by the isolation of the virus in embryonated chicken eggs, cross serum-neutralization and cross immunity tests. Postmortem examination reveals catarrhal tracheitis, bronchitis and air sacculitis with slight thickening and clouding of the air sac membranes. The fluorescent antibody test on the scrapings from trachea, complement fixation, passive haemagglutination and immunodiffusion tests provide confirmatory diagnosis. In some laboratories PCR or DNA probes are also being used.

Treatment, prevention and control:
Rise in room temperature from 3 to 6 C may lower mortality rate. Food consumption should be stimulated by all possible means. Immunization may be carried out by the use of modified live virus vaccines, which produces relatively mild respiratory symptoms. These vaccines are usually administered through drinking water or as a dust or spray. It generally takes about 3 weeks for most of the birds to acquire a high degree of immunity following vaccination

Posted Date: 9/18/2012 8:35:34 AM | Location : United States

Related Discussions:- Poultry and duck diseases-avian infectous bronchitis (ib), Assignment Help, Ask Question on Poultry and duck diseases-avian infectous bronchitis (ib), Get Answer, Expert's Help, Poultry and duck diseases-avian infectous bronchitis (ib) Discussions

Write discussion on Poultry and duck diseases-avian infectous bronchitis (ib)
Your posts are moderated
Related Questions
Why can mitochondria be considered the power plants of the aerobic cells? Ans) Mitochondria are the "power plants" of aerobic cells due to within them the final stages of the ce

Define Ziehl-Neelsen Staining Technique? Ziehl-Neelsen staining is used for staining these bacteria. The technique was discovered first by Robert Koch during his pioneering inv

sir i''m not understanding cell division rightly. in case of meiosis both paternal and maternal chromosome goes in two cell separately while in case of mitosis they go alongwit

What is the basic structure of a virus? Viruses are constituted of genetic material (DNA or RNA) covered by a protein capsule also called as a capsid. Some viruses, like HIV, h

Vitamin B Complex The vitamin B complex comprises the vitamins B 1 , B 2 , B 6 and B 12 as well as the vitamin B factors biotin, folic acid, nicotinic acid and its amide as w

Define Simple, Compound, Derived Lipids? Simple lipids are fatty acid esters of glycerol, called triacyglycerols or triglycerides (for e.g. fats and oils) or higher alcohols (

One of the free-living, anaerobic nitrogen-fixer is: 1. Beijernickia 2. Rhodospirillum 3. Rhizobium 4. Azotobacter Rhodospirillum

What is pollen? Pollen grains are the male gametophytes of the phanerogamic (flowering) plants. Thus within the pollen grains the male gametes of these plants are produced by m

Excluding the effects of cardiac output and hormones, describe the other factors that may affect blood pressure and blood flow in a middle-aged man who is exercising in an aerobics

A fire hose ejects a stream of water at an angle of 38.8 ° above the horizontal. The water leaves the nozzle with a speed of 26.6 m/s. Assuming that the water behaves like a projec