Session 9 - Microbiology of the GI tract Flashcards
What are the roles that bacteria play in supporting the normal function of the GI tract?
- Synthesise and excrete vitamins that are absorbed by host. Vit K, B12, thiamine and many other B vitamins.
- Prevent colonisation by pathogens
- Kill non-indigenous bacteria
- Stimulate development of MALT (mucosal associated lymphoid tissue)
- Stimulate production of natural antibodies
What 3 gram positive aerobic cocci inhabit the GI?
Staphylococci
Streptococci
Enterococci
All -cocci
What 2 gram negative aerobic cocci inhabit the GI?
Neisseria meningitidis
Neisseria gonorrhoeae
All neisseria
What 2 gram positive aerobic bacilli inhabit the GI?
Mycobacterium TB
Lactobacillus
What 4 gram negative aerobic enteric bacilli inhabit the GI?
E coli
Salmonella
H pylori
Vibrio cholera
What 2 non enteric gram negative aerobic bacilli inhabit the GI?
H. influenzae
Bordetella pertussis
What gram positive anaerobic bacilli inhabits the GI?
Clostridia tetani, difficile, and perfringens
What enteric gram negative anaerobic bacilli inhabits the GI?
Bacteroides fragilis
Give a common cause for oral thrush and its treatment
Candida albicans - amphotericin lozenges
Give a common cause for gingivitis
streptococcus mutans
Give a common cause for parotitis
staph aureus
Give a common viral and bacterial cause for tonsilitis
Adenovirus.
Strep pyogenes
Give a common cause for peptic ulcers
H pylori
What prophylaxis would you give to reduce surgical site infections?
Metroniadazole kills anaerobes and a broad spectrum antibiotic such as gentamicin or cephalosporin given.
Why is lactobacillus physiologically important in the vagina?
- Produces acidic environment in vagina
- Prevents other bacteria and candida albicans from growing
