A STREPTOCOCCUS PRODUCING SYMPTOMS OF CHOREA IN A DOG

Abstract

The streptococcus spoken of in this report was isolated from the throat of a patient with a case of chorea of five years' duration, Similar organisms have been isolated from a number of cases of more acute chorea. A detailed report will be published in the Journal of Infectious Diseases. The streptococcus as grown on hlood-agar forms a heavy, dirty-white growth with a border well raised above the medium and a wide zone of hemolysis. It grows aerobically and anaerobically equally well and grows on all ordinary media. It ferments milk with slight acid production but no coagulation. It does not ferment dextrose, lactose, mannite, inulin or saccharose. As grown on the surface of agar-slants, the strep tococcus is a Gram-positive organism occurring in irregular groups and short chains with such in abundance of smaller Gram-negative forms as to give the impression of a mixed culture. In milk it grows in