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The zoo discovered the virus after six African antelope fell ill and died in October of malignant catarrhal fever.

The zoo says Thursday that they made the “difficult yet responsible decision” to euthanize the mountain goats last month because of malignant catarrhal fever.

Such local epidemics are without doubt due to local causes, and are of the nature of simple ordinary catarrhal fever, rather than true influenza.

M. le Docteur Roche was sent for: he pronounced the disorder to be a catarrhal fever; the symptoms nothing unfavourable; the perspiration beneficial, but excessive; and ordered the removal of some of the bed-clothes.

Soon afterwards a catarrhal fever or influenza became prevalent.