What is the diagnosis and what pathogens are likely to be involved?
A two-crop ewe at pasture with month-old twin lambs at foot is found isolated from the remainder of the flock. The ewe appears very stiff and drags the left hindleg. The ewe is profoundly depressed with toxic mucous membranes. The rectal temperature is elevated (40.6°C (105.1°F)). The pulse is increased to 120 beats per minute. The respiratory rate is increased to 45 breaths per minute. There are no ruminal sounds. Examination of the udder reveals extensive gangrenous mastitis of the left gland with subcutaneous oedema extending along the ventral abdominal wall to the brisket.
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