29/01/2024
VIRAL DISEASES
For more visit here instagram.com/veterinarians_to_be
1- FOOT & MOUTH DISEASE
✓Aphthovirus/picornavirus( smallest virus of animal origin)
✓ first virus to be completely
sequenced
✓Vesicular lesions in cattle are on oral mucosa ,over lips & dorsum of tongue & palate , udder.
✓ Lesions seen over skin near coronary band adjacent to inter- digital space.
✓ 100% mortality
✓ myocardial necrosis with apperance of greyish areas of stripes in the ventricles called "Tigroid heart necrosis" in case of very young animals.
✓Balloon degeneration of epithelial cells in the layer stratum spinosum.
✓ vesicle = virus+ leucocytes+ necrotic epithelial cells+ erythrocytes.
✓Vaccine - Formalised virus , Aluminium hydroxide gel,oil emulsion
2- RINDERPEST
✓A/k cattle plague/ bovine typhus.
✓Morbili virus/ paramyxoviridae
✓ Lethargy, Depression, dehydration, emaciation
✓ small , discrete, necrotic areas with sharp wall,deep erosion with red floor in lower lips,ventral surface of free portion of tongue.
✓ incubation,pro dermal,mucosal , convalescent stage respiratory & Digestive system affected.
✓ Zebra- stripes in ileo- caecal junction ,colon.
✓ sloughing of epithelium over necrotic colon peyer's patches.
✓ Inclusion Bodies - Eosinophilic I/N & Basophilic I/C ( cowdry type B)
3⃣ PESTEDES PETITIS RUMINANTS
✓ A/K Morbilivirus /paramyxoviridae
✓ Soiled hind quarters with soft/Watery faeces.
✓ Erosion, necrosis & ulceration in oral mucosa.
✓ Bran like necrotic materials in palate.
✓ zebra- stripes in ileo- caecal region.
✓ Faeces contain blood, necrotic tissue, blood clot.
✓ congestion, ulceration & haemorrhage in intestine.
✓ Inclusion Bodies - I/C & I/N in multi nucleated giant cells.
4⃣ BOVINE VIRAL DIARRHOEA
A/K Mucosal disease
✓ pestivirus
✓ Trans- placental transmission to fetuses through infected mothers/ dams
✓ Abortion in pregnant cattle.
✓ biphasic fever
✓ sharply defined or irregular shaped ulcers or erosions in dental pad ,palate, muzzle
✓ profuse foul smelling w