Mycoplasmas, Spirochetes, Chlamydia, and Rickettsia - Robison

Question 1

What are some characteristics of mycoplasmas?

Answer 1

Smallest free-living microbes
Lack cytochromes, cell walls, and enzymes of the krebs cycle
Require GF
Can colonize on the mucous membranes of the respiratory and urinary tract

Question 2

Describe mycoplasma pneumoniae and the disease(s) that it causes

Answer 2

Attatches to receptors of epithelial linings
Causes atypical pneumonia or walking pneumonia

Diagnosis is difficult because it is small and slow growing

Question 3

Describe Rickettsia

Answer 3

Extremely small
Nearly wall less because of small amount of peptidoglycan
Obligate intracellular parasites

Question 4

Rocky Mountain Spotted Fever is caused by what organism and how is it transmitted?

Answer 4

Rickettsia Rickettsii

Transfered by Ticks

Question 5

Epidemic Typhus is caused by what organism?

Answer 5

Rickettsia prowazekii

Mortality is 70% without treatment

Question 6

Describe Chlamydias

Answer 6

Has two membranes without a cell wall
Grows and multiplies within the vesicles of the host cells
Obligate intracellular parasites
Have elementary and reticulate bodies

Question 7

What are the two main diseases that chlamydia causes?

Answer 7

Chlamydia trachomatis

Causes Sexually transmitted diseases (lymphogranuloma veneruem) and an ocular disease called trachoma

Question 8

Describe spriochetes

Answer 8

Tightly coiled helically shaped bacteria
G- walls with flagella located in the periplasmic space
Most non-pathogenic
Corkscrew

Question 9

What are the three types of spirochetes that cause disease?

Answer 9

Treponema, Borrelia, and Leptospira

Question 10

What does treponema cause?

Answer 10

Syphilis

Three stages: last stage is gummas

Question 11

What does borrelia causes?

Answer 11

Lyme Disease and Relapsing fever

Get from ticks and causes bullseye rash

Question 12

What does leptospria cause?

Answer 12

Leptospirosis

Enters through invisible cuts and direct contact with infected urine or contaminated water sources

Question 13

What does Vibrio cholerae cause?

Answer 13

FIREHOSE DIARRHEA
Cholera
contains AB toxin that allows the release of ions

Question 14

What is the most common cause of gasteroenteritis in the US?

Answer 14

Camplyobacter jejuni

Get it from infected food, milk, or water

Question 15

Most stomach ulcers are caused by what?

Answer 15

H. pylori