MCB 2610 Study Guide - Quiz Guide: Gram-Positive Bacteria, Streptococcus, Rebecca Lancefield
8 Sep 2016
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Long irregular shaped rods, single or in short chains, often drumstick with a bulge at the terminal end. 2-5% of the population have in their intestines kept under control by normal flora. First isolated from infant stool and named bacillus difficilis by hall & o"toole in 1935 due to its difficulty to grow in lab. Resistant to most antibiotics that kill other microbes (because spore forming) Hand washing with 0. 55% bleach is best. Saccharomyces spp: stool transplant has also been found to be successful. Gram stain: gram positive (blue/purple, strict anaerobe. Avery welch exam 2 microbe minutes: spore-forming can survive for up to 2 years on inanimate objects, produces a capsule, variable in size (2-9 x 0. 3-0. 8 um, grows optimally at 37c (on blood agar without o2) First isolated by bill roth in 1874 from wound infections. Classified by rebecca lancefield in 1930s by using m (220 serotypes) and t antigens (20 serotypes)
