Special Veterinary Pathology

VIRAL DISEASES

Gross specimens 

• FMD - Mouth lesion – Cattle
  • The vesicles are found on the dorsum of the tongue especially near its anterior part& lateral aspects,on the mucosa of lips,cheeks,gums,dental pad & hard palate.
  • Sometimes lesions are found on the muzzle&external nares.
• FMD -Heart – Calf
  • The affected heart is dilated & flabby.
  • The ventricular musculature,the septal wall of the left ventricle & the papillary muscles are affected which show grayish streaks giving the heart a “tigroid”appearance.
• Rinderpest - Tongue – Cattle
  • Vesicles are noticed on the ventral surface of the free portion of the tongue
  • Vesicles rupture and form erosions
• Rinderest - Abomasum – Cattle
  • Necrotic foci accompanied by haemorrhagic streaks are visible
  • The folds of abomasum are thick & edematous and the contents are chocolate coloured due to the presence of blood
  • Necrotic foci accompanied by haemorrhagic streaks are visible
  • The folds of abomasum are thick & edematous and the contents are chocolate coloured due to the presence of blood
  • Necrotic epithelium may slough off forming ulcers ecrotic epithelium may slough off forming ulcers
• Rinderpest - Rectum - Bullock
  • The folds of rectal mucosa shows streaks of haemorrhages giving rectum the characteristic”zebra markings”appearance
• Blue tongue - Tongue – Sheep
  • The tongue is cyanotic and shows hyperaemia,edema and multiple haemorrhages.
  • Sometimes ulcers may be seen on the lateral surface adjacent to the teeth.
• Hog cholera - Larynx and trachea - Pig
  • Haemorrhages in the mucosa of larynx and trachea
  • Necrotic ulcers may also be noticed
• Hog cholera - Kidney – Pig
  • The mucosa of caecum show spherical,circumscribed,single or multiple ulcers which originate as small congested areas and develop into encrusted characteristic “button shaped”ulcers.

Swine fever - Kidney - Petechial haemorrhages

Gross description

• Hog cholera -Intestine– Pig

Swine fever - Caecum - Button ulcer