Microorganisms Flashcards
What is Escherichia coli?
A normal inhabitant of the GI tract, can become highly virulent when it produces a Shiga toxin.
What is MRSA?
Methicillin resistant staphylococcus aureus
Name a defence mechanism of Mycobacterium tuberculosis.
Mycolic acid in the cell walls which provides a waxy coating that prevents desiccation.
Name a defense mechanism of Pseudomonas aeruginosa.
Lives in an amoeba host in the environment which allows it to avoid predation by protozoa.
Name a defence mechanism of Clostridioides difficile.
Endospore formation that provides the ability to resist drying, chemical agents, and heat.
What is the reservoir of Ricksettsia rickettsii and what disease does it cause?
Reservoir: Ticks
Causes: Rocky Mountain Spotted Fever
What microorganism causes Lyme disease and what is the common reservoir?
Caused by Borrelia burgdorfer and transmitted by ticks.
What microorganism causes Malaria and what is the common reservoir?
Caused by Plasmodium falciparum and transmitted by mosquitos.
What microorganism causes Legionnaire’s disease and what is the common reservoir?
Caused by Legionalla pneumophilia.
Reservoir: contaminated water sources
What is the gram stain and cell structure of Chlamydia?
Gram-negative coccoid.
What is the gram stain and cell structure of Ricksettsia rickettsii?
Gram-negative rod shaped bacteria or coccobacilli
What is the gram stain and cell structure of Clostridioides difficile?
Gram-positive, anaerobic bacillus.
What is the gram stain and cell structure of M. tuberculosis?
An aerobic, poorly staining gram-positive acid-fast bacillus.
Pairs and chains of Gram-positive cocci is most likely:
Streptococcus spp.
Clusters of Gram-positive cocci is most likely…
Staphylococcus spp.
Gram negative diplococci is most likely…
Neisseria spp.
Gram-negative coccobacilli is most likely…
Haemophilia spp.
What is the gram stain and cell structure of Enterobacteriaceae?
Facultative ram-negative bacilli.
Aerobic Gram-negative fastidious bacteria that do not grow on standard bacteriologic media:
Legionellaceae
E. Coli gram stain and shape:
Gram-negative bacillus
Gram stain, etc for Salmonella
Gram-negative, non-spore forming, facultative anaerobic bacillus
