Abstract

The authors isolated a strain of Neisseria mucosa from a patient with acute lymphoblastic leukemia and observed some biological characteristics. The organism is Gram negative diplococcus with thin capsule and positive for the oxidase, catalase and nitrate reduction test, and grows well on the plain agar at the 2 2℃ and 45℃. No acid production from the various carbohydrates except dextrose observed, and negative H₂S from TSI, urease, phenylalanine deaminase, ornithine and lysine decarboxylase, and nonhemolysis on the blood agar was noted. Intraperitoneal inoculation of the organism revealed pathogenic for the mice.