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.


Epidemiology:
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
Injury Resulting From an Accident Accident was described earlier which meant that accident was a sudden event. However, several legal opinions favored exclusion of suddenness

what is the role of cholesterol in membrane fluidity?

How is extracellular digestion related to cellular and tissue specialization? Several of specialized cells and tissues appeared with extracellular digestion to give enzymes and

What is the role of Linked Traits in genetics? In his study of inheritance in the fruit fly, Morgan observed that certain genes are distributed together, or linked, rather than

REASON'S FOR MENDEL'S SUCCESS 1.         Mendel selected only pure breeding varieties of pea ( Pisum sativum ) for his experiments. 2.         Mendel took only those traits

Informatics  is the study of the application of computer and statistical techniques to the management of information. In the genome projects, informatics includes the development o

What is hemodialysis? Hemodialysis is the artificial blood filtration made by exact machines in substitution of the kidneys. Hemodialysis may be essential in patients suffering

Hormone s . Cortical steroids (corticoids-hormones of adrenal cortex) are grouped into three catagories : mineralocorticoids, glucocorticoids and gonadocorticoids. (i) Mine

Define Vitamins and Minerals needs in Nutrient Requirement and Dietary Management Although the exact requirements are not known, it is generally recommended to give plenty of f

What is firing rate of carotid artery baroreceptors At 1:00 AM, person X's blood pressure is equal to the blood pressure set point.  At 1:01 AM, there is a decrease in the firi