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20 Cards in this Set
- Front
- Back
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What organisms?
-Retention of crystal violet following alcohol decolorization step of Gram stain thus appearing purple in color, (Gram positive) -Generally grow easily after 24 hours on nonselective agars like sheep blood agar (SBA |
Aerobic Gram-positive bacilli
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What is the cell size of Aerobic Gram-positive bacilli?
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~0.2 to 1.5 microns wide; ~0.5 to 10 microns long
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what organisms are spore forming?
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Bacillus species
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what organisms are non-spore forming?
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Listeria, Erysipelothrix, Corynebacterium, and
others |
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What organism has these characteristics?
-More than 50 species, all are found in soil • form endospores • All are catalase positive |
Bacillus spp.
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What Bacillus species is the most virulent and significant human disease.
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Bacillus anthracis
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What Bacillus species is the
– most common disease is food poisoning – less common opportunistic infection |
Bacillus cereus
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What 3 ways can Anthrax be transmitted?
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– Cutaneous: direct contact with infected material
(wool sorters disease) – Inhalation: aspiration of spore aerosol – Gastrointestinal: eating of contaminated meat |
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What form of Anthrax has
-Incubation period: 1–12 days -Case-fatality: • Without antibiotic treatment—20% • With antibiotic treatment—1% |
Cutaneous
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What form of Anthrax
Incubation period: 1–7 days (possibly ranging up to 42 days) Case fatality: Without antibiotic treatment—97% With antibiotic treatment—75% |
Inhalaltion
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What form of Anthrax has
Incubation period: 1–7 days Case-fatality: 25–60% (role of early antibiotic treatment is undefined) |
Gastrointestinal
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What antibiotic are used to treat Anthrax?
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Ciprofloxacin, tetracycline (60 day treatment)
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What 2 forms of food poisoning is Bacillus cereus associated with?
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– Diarrheal – meat, 24 hrs, self limiting
– Emetic – fried rice, 10 hrs, self limiting |
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What spp is a
Opportunistic disease – Serious ocular infection – Wound infection |
Bacillus Cereus
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What is used as therapy against Bacillus Cereus.
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Flouroquinalones, tetracylcines
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What GPB
-Grows aerobically • No spores • Not acid fast • Able to grow at 4°C unlike many other bacteria |
Listeria
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the Most virulent of the Listeria and common human
pathogen is? |
Listeria monocytogenes (causes Listeriosis)
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Who are most prone to Cutaneous Listeriosis – occupational exposure?
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Meat processors and veterinarians
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What organism can cause
• Complications of pregnancy - Meningitis • Sepsis |
Listeria monocytogenes
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What aerobic GBP has
Beta hemolytic (clear zone) – Biochemical profile – Motility characteristics – Growth at 4°C |
Listeria monocytogenes
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