Ch. 38 - Less Common G-b

Question 0

Cardiobacterium hominis

Characteristics
Disease
Diagnosis

Answer 0

Small, pleomorphic non-motile G-b 
Facultative 
Fastidious
Rosette arrangements on GS
OXI +
CAT -
Fermentative

Upper resp
Low virulence
Heart damage in pre existing heart/oral disease, recent dental work

Microscopy or biochemical testing
Pen or ampicillin; resistant to erythromycin

Question 1

Bartonella

Answer 1

Short G-b

Aerobic

Fastidious

Animal reservoirs (direct or insect)

Question 2

Capnocytophaga

Characteristics
Disease
Diagnosis

Answer 2

Filamentous disinformation G-b
A or Ana, CO2
Some strains - oropharynx (periodontitis, septicemia, rarely endocarditis)

Other strains - oral cavities cats and dogs (bite wounds)

Beta lactamase production (treat with augmentin)

Question 3

Streptobacillus moniliformis

Characteristics
Vectors
Disease

Answer 3

Long thin G-b (pleomorphic with age)
Poor GS

Rodent bites, rarely contaminated food/water

Fever, chills, joint pain, rash (hands and feet)

Pen or tetracycline

Question 4

Bartonella henselae

Answer 4

Oropharynx of cats and fleas
Cat-scratch disease

Benign infection (children) regional adenopathy

^ IgM and clinical presentation

Question 5

Bartonella quintana

Answer 5

Contaminated feces of human body louse (homeless, poor hygiene)

5 day fever / trench fever
Headache, fever, weakness, pain in long bones

HIV pts have bacteremia and recurrent fever