7: Gram Negative Bacteria Flashcards
Specific plate and agar for growing Neisseria
“Chocolate agar” (heated blood), on Thayer-Martin agar (VCN Abx modified)
Two Neisseria meningitis vaccines and what groups they target
- MenACWY: preteens and teens
2. MenB: 16-18 year olds
PID
Pelvic inflammatory disease; infection of uterus, Fallopian tubes, and ovaries - can cause sterility
Enterics
Gram negative bacteria that are part of the normal GI flora or cause GI disease
Three bacterial mechanisms that cause different types of diarrhea
- Lack of invasion -> watery diarrhea
- Epithelial invasion -> blood diarrhea, fever, cramps
- LN and blood stream invasion -> diarrhea +/- blood, fever, abdominal pain -> sepsis
Agar used to see if bacteria ferments lactose and what color it changes
MacConkey agar -> turns pink
What do ETEC, EIEC, EHEC, and HUS stand for?
- ETEC: Enterotoxigenic E. coli
- EIEC: enteroinvasive E. Coli
- EHEC: enterohemorrhagic
- HUS: hemolytic uremic syndrome
Most common cause of UTIs
E. coli
Most common species of Shigella in the US
Shigella sonnei
Explain Typhoid Mary
Typhoid fever can have a asymptomatic chronic carrier state - Typhoid Mary was an asymptomatic cook in the 1900’s
What does urease do?
Breaks down urea -> CO2 + ammonia
Susceptible individuals to pseudomonas aeruginosa
CF, burn victims, hospitalized pts, diabetics
Reiter’s Syndomre: describe
A post-infectious immune mediated reaction, AKA reactive arthritis
Gene associated with Reiter’s syndrome
HLA-B27
Classic triad of Sx in Reiter’s syndrome
Conjunctivitis, urethritis, arthritis
