Flashcards in 7. Aerobic Gram-positive Bacilli Deck (57):
Spore forming aerobic gram-positive bacilli
Non-spore forming aerobic gram-positive bacilli
Bacillus spp. are found in
True/False. Only some Bacillus spp. form endospores.
ALL species of Bacillus form endospores
Catalase reaction of Bacillus spp.
Bacillus spp. that is commonly associated with food poisoning
Type of food poisoning that is from meat, 24 hours, self-limiting
Type of food poisoning from fried rice, 10 hours, self limiting
Produced by B. cereus that causes the food poisoning
Colony morphology of B. cereus
Catalase reaction of B. cereus
Most common disease cause by B. cereus
Most virulent Bacillus spp.
How do humans acquire B. anthracis?
Contact with anthrax-infected animals or animal products (no person-to-person spread)
Clinical presentation of B. anthracis
3 forms of Anthrax
Anthrax form that is most commonly encountered in naturally occuring cases
Incubation period of cutaneous anthrax
Anthrax form that begins as a "viral-like" illness
Incubation period of inhalation anthrax
Anthrax form that exhibits abdominal distress, usually accompanied by bloody vomiting or diarrhea
True/False. Recovery from Anthrax confers immunity.
Antibiotics used after exposure to anthrax
Colony morphology of Bacillus anthracis
Medium to large irregular
Medusa head projections, non hemolytic
Catalase reaction of Bacillus anthracis
Microscopic chracteristics of Listeria spp.
Gram-positive short rods or coccobacilli
What temperature can Listeria spp. grow unlike other bacteria?
Most virulent Listeria spp.
Disease caused by L. monocytogenes
Habitat of Listeria spp.
True/False. Listeriosis can be passed onto the fetus
Colony morphology of L. monocytogenes
Umbrella pattern motility
Growth at 4°C
Most clinically significant Erysipelothrix spp.
Disease caused by E. rhusiopathiae; a cutaneous infection in humans occasionally acquired by contact with infected animals
Microscopic appearance of E. rhusiopathiae
Small gram-positive bacilli occuring singly/short chains/filaments
Oxygen requirements of E. rhusiopathiae
Catalase reaction of E. rhusiopathiae
Specimen of choice for E. rhusiopathiae
Gram stain appearance of suspect lesion for E. rhusiopathiae
Pleomorphic gram-positive Bacillus
Agar used to cultivate E. rhusiopathiae
SBA with 5-10% CO2
H2S reaction of E. rhusiopathiae on TSI slant
Microscopic appearance of Corynebacterium spp.
Small gram-positive bacilli
May resemble Chinese letters
Chracteristic colonial morphology of Corynebacterium spp.
Most significant Corynebacterium human pathogen
Produced by C. diphtheriae that causes death of eukaryotic cells and tissues by inhibition of cell protein synthesis
Vaccine for C. diphtheriae which maintains the antigenicity of the toxin without the toxicity and prompts production of toxin-neutralizing antibody
General media for C. diphtheriae
Selective medium for C. diphtheriae
Cystine-tellurite medium (CTBA)
Colony morphology of C. diphtheriae in CTBA
Black to gray
Differential medium for C. diphtheriae
Colony morphology of C. diphtheriae in Tinsdale medium
Black with brown halos
Urease reaction of C. diphtheriae
Nitrate reaction of C. diphtheriae
Catalase reaction of C. diphtheriae
Corynebacterium spp. important in nosocomial or immunocompromised people
Corynebacteria count that is significant in urine specimens