Infectious Diseases Plate Rounds 1-10-24.pptx

1. Plate Round Discussion 1/10/24
• Case 1: Pasteurella Bacteremia
• Case 2: GPB from gunshot wound/intra-abdominal abscess
• Case 3:Mycobacterium haemophilum

2. Pasteurella Multocida
• Named after Louis Pasteur (1822-
1895), chemist and bacteriologist in
Paris
• Part of the normal flora of the
respiratory tract in animals
• Through contact with these animals
(licking, biting and scratching),
humans can be infected, often by
cats and dogs.
• P. multocida the most virulent

3. Diagnostic testing
• Gram negative bacillus
• Oxidase positive, indole positive, catalase
positive.
• Demonstrate growth on SBA but not on MAC.
• Susceptibility: Testing NOT performed.
Predictably susceptible to penicillin, ampicillin,
broad-spectrum penicillin, second and third
generation cephalosporins, tetracycline and
chloramphenicol

4. Mycobacterium
Fortuitum /GPB
Bacteremia
• fast-growing non-tuberculous mycobacteria (NTM) that is found in the environment
(found in soil and water)
• referred to as “acid-fast bacteria,” a term referencing their response to a laboratory
staining technique.
• Contaminated ice machines are a relatively important hospital reservoir for the Rapid
Growing Mycobacteria

5. Diagnostic testing
• Gram-positive, nonmotile and acid-fast rods
• Colonies are white, rough and wrinkled
• Obligate aerobic

6. Mycobacterium haemophilum
• Short, occasionally curved, gram-positive,
nonmotile and strongly acid-fast rods.
• Nonpigmented and rough to smooth colonies.
• Is an aerobic fastidious organism that grows best
at 30–32°C and is a slow-growing organism first
identified in 1978
• Growth also depends on the presence of iron or
haemin, which is a unique feature. Because of this
requirement, it will not grow with standard
isolation techniques for other mycobacteria

10. HSV
Esophageal Ulcer