Microbio

Question 1

Bite infections: cat

Answer 1

Pasturella sp.
- gram negative rod
- blood and chocolate agars
- soft tissue infection: cellulitis, abscess, septic arthritis, osteomyelitis
- invasive infection: meningitis, endocarditis
- respiratory infection: pneumonia in those with chronic disease

Question 2

Bite infections: dog

Answer 2

Pasturella sp.

Bartonella sp.
- cat-scratch disease
- regional lymphadenopathy

Capnocytophaga canimorsus
- filamentous, gram negative bacillus
- DF-2 strain
- severe sepsis and meningitis, particularly in asplenic patients and alcoholics

Question 3

Bite infections: human

Answer 3

Eikenella corrodens
- aerobic gram negative rod
- blood agar: corrodes area around colony
- head/neck infection, sinusitis, pulm infection, arthritis, endocarditis, intra-abdominal infection

Staph aureus
Strep sp.
Fusobacterium
Porphyromonas sp.

Peptostreptococcus
- elongated gram positive coccus in chains

Prevotella melaninogenica
- anaerobic gram negative rod
- blood agar: black colonies

Veillonella sp.
- gram negative diplococcus