Part 2 Bacteriology Quiz Gram Positive Rods
III. Bacillus and Other GPR - LARGE GREY FLAT IRREGULAR COLONIES, RHIZOID OR MEDUSA'S HEAD
| Bacterial Species | Other names | Important Characteristics | Lab Identification | Types of Infections & Clinical significance |
| Bacillus anthracis | Anthrax | in soil, enters via food, wound or inhalation (Woolsorter's disease) | Pen sensitive
GPR, long chains, very |
Terrorism Easily treated with Pen Anthrax - inhalation, wound (cutaneous) and GI |
| Bacillus cereus | Creates two types of intoxication; diarrheal & emetic | Pen resistant | food intoxication & rarely wound (trauma to eye or heart) |
IV. Listeria, Corynebacterium, Erysipelothrix & Lactobacillus
| Bacterial Species | Other names | Important Characteristics | Lab Identification | Types of Infections & Clinical significance |
| Corynebacterium diphtheriae | Carried in Humans; lysogenic; requires antitoxin treatment | Palisades &
Chinese letters can't be differentiated from normal flora, non-motile, urease - , catalase +, ferments glucose and maltose Use selective media : Cysteine-tellurite blood agar & Tinsdale's |
Diphtheria - pseudomembrane | |
| Listeria monocytogenes | Found in the environment, food pathogen, associated with | Short chains
GPR; small colonies, catalase +, esculin +, beta hemolytic hippurate positive |
Gastrointestinal to blood to meninges (stillbirths) | |
| Erysipelothrix rhusiopathiae | Carried by animals | short rods and
long filaments non-motile catalase -, H2S + |
Puncture wound associated with animal contact to septicemia | |
| Lactobacillus spp. | GPR pleomorphic | catalase -, nonspore forming GPR | ||
| Gardnerella vaginalis | Haemophilus vaginalis | coccobacilli; clue cells; grows on CAP, CNA but not BAP | Bacterial vaginosis |
V. Branching and Partial AFB GPR - difficult to isolate and identify
| Bacterial Species | Other names | Important Characteristics | Lab Identification | Types of Infections & Clinical significance |
| Nocardia asteroides (80% of Nocardia infections) | LONG GROWTH PERIODS | GPR beaded, branched and filamentous; hyphal-like elements; ubiquitous in the environment | direct
examination p359 mycolic acid in cell wall catalase +, strict aerobes, filamentous and branching, hyphal -like |
Mostly
immunocompromised patients Traumatic wound or inhalation Some are intracellular parasites |
| Streptomyces | non-AFB | Wounds | ||
| Actinomycetes | non-AFB; branching | presence of granules in the specimen | Wounds |