Isolate

Morphology

Catalase test

Gram reaction

Carbohydrate utilization

X

Bi-concave edge, yellow colonies

(−)

G (+) short rod/coccobacillus

(+)

Y

Smooth-edge white colonies

(−)

G (+) rod with variable staining

(+)

Z

Muffy-edge white colonies

(+)

G (+) oval shape with buddings

(+)