An otherwise healthy 69-year-old male presents to his physic…
An otherwise healthy 69-year-old male presents to his physician with fever and shortness of breath. Chest x-ray reveals a right lower lobe pneumonia. Gram stain of an expectorated sputum specimen show many neutrophils, few squamous epithelial cells, rare Gram-positive cocci in chains, and many plump Gram-negative diplococci. Sputum culture reveals few small, round alpha hemolytic colonies and many medium, tan gamma hemolytic colonies on BAP. The growth on CHOC plate is similar to BAP. MAC has no growth. When a tan colony is touched with an inoculating loop it slides on the plate like a hockey puck. Oxidase and butyrate test on the tan colonies are both positive. What organisms is causing this man’s pneumonia?