Infections with Encephalitozoon cuniculi and Leptospira interrogans, serovars grippotyphosa and ballum, in a kennel of foxhounds.

Leptospira interrogans serovars grippotyphosa and ballum were isolated from kidney and urine of an American Foxhound pup. The pup was from a litter of 12, all of which were unthrifty. Titers for serovar grippotyphosa in pups from the litter ranged from 200 to 6,400 and 23 of 36 adult dogs in the kennel had titers to that serovar. None of the sera was tested for antibodies to serovar ballum. Leptospires were not isolated from or observed in 2 littermates and 1 penmate, but gram-positive organisms morphologically compatible with Encephalitozoon cuniculi were detected in their brains and kidneys.