Veterinary Preventive Medicine-II

CLINICAL MANIFESTATIONS

• Incubation period is 4-8 days after natural infection.
• The disease may appear in three clinical forms
  • Malignant form
  • Mild (benign)form
  • Abortive form
• Malignant form
  • Most common
  • Lacrymation, salivation, serous nasal discharge, swelling of the eye lids, congestion of mucous membranes.
  • High fever with pock lesions on the eye lids, lips, nostrils, ears, cheeks, inner side of the thigh, scrotum, prepuce, vulva, under the tail, chest region and buccal mucosa.
  • Lesions first appear as macules, then turn into papules, which transform into large vesicles followed by necrotic changes in the vesicles results in scab formation.

    

• If lambs are affected mortality-50 %
• Death due to respiratory embarrassment 

• Mild (benign) form
  • Common in adult sheep
  • Common form of the disease in indigenous breeds of sheep
• Abortive form
  • Pregnant ewes abort, foetus show pock lesions
  • In lactating ewes- mastitis due to lesions in the udder

Lesions

• Characteristic papules, vesicles, pustules and scabs on cutaneous surface
• Lesions in the mucosa of respiratory and alimentary tract especially in the trachea