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Common Bacterial Infections In Chickens Notes

Veterinary Medicine Notes > Common Bacterial Infections in Chickens - Veterinary Bacteriology Notes

This is an extract of our Common Bacterial Infections In Chickens document, which we sell as part of our Common Bacterial Infections in Chickens - Veterinary Bacteriology Notes collection written by the top tier of Universiti Putra Malaysia students.

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E. coli

Colibacillosis or colisepticem ia in poultry

Description

c/s

Dx

Prevention, tx n con

Bac. name

Disease name

Systemic disease - bacteremia (acute septicemia or subacute airsacculitis
&polyserositis in young broilers).

Postmortem lesions - hepatitis &splentitis, with increased fluids accumulations in the thoracic and abdominal cavities.

*Survivors of acute septicemia usually develop pericarditis, perihepatitis&
fibrinopurulent airsacculitis.

*Other less common disease manifestation - pneumonia, salpingitis, arthritis &
osteomyelitis.

Samples Septicemic disease - heart blood, bone marrow &parenchymatous organs Isolation of E. coli Media - tryptose blood agar
&MacConkey agar Incubation - aerobic, 37oC for 24 to 48 hours Colonies on blood agar - smooth or rough (2-3mm in diameter), low convex, moist, shiny, entire & grey) Colonies on MacConkey agar - lactose positive Identification of E. coli Tube biochemical or commercial strip test. (TSI, SIM, Oxidase, catalase, nitrate reduction) Molecular detection method - PCR to detect virulence factors genes

Antibiotic

*Antibiotic susceptibility tes

*Amoxycillin, tetracyclines, neomycin (intestinal activit gentamycin or ceftiofur, po sulphonamide, flouroquinol

Prevention

*Good hygiene in handling hatching eggs, hatchery hy good sanitation of house, fe water. Well-nourished embr optimal incubation to maxim old viability.

*Control of predisposing fac infections (usually by vaccin

Pullorum disease (bacillary white diarrhoea )

-Chicken (aftr 2w hacthing)
-Route of infection is oral or via the navel/yolk. Septicemia, highly fatal to eggs and chicks
-Birds huddle together &
exhibit a white foamy diarrhea. Adult birds loss of appetite, weakness, greenish brown diarrhea

-The mortality rate is high and affected birds anorexic, depressed and have whitish fecal pasting around their vents.

*Characteristic lesions include whitish nodes throughout the lungs and focal necrosis of liver and spleen.
-Inappetance, depression, ruffled feathers, closed eyes, loud chirping, white diarrhea, vent pasting, gasping, lameness

Samples GIT disease - intestinal contents Septicemic disease - heart blood Isolation of Salmonella spp Media - Rappaport-Vassiliadis medium, xylose lysine deoxycholate (XLD) agar, MacConkey agar. Incubation - aerobic, 37oC for 24 to 48 hours Colonies on XLD- pink colonies with black centre/completely black Colonies on MacConkey agar - non lactose fermenting Identification of Salmonella spp Tube biochemical or commercial strip test. (TSI, SIM, Oxidase, catalase, nitrate reduction) Molecular identification method
- PCR targeting Salmonella-specific genes.

Antibiotic Amoxycillin, tetracycline, fluoroquinolones (pullorum disease in chicken)

Innate immune response important in controlling the phases of infection with Salmonella spp Eradication

*can be largely eradicated infected adult birds are slaughtered.

*good hatchery hygiene.

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