micro final review Flashcards
what does WBC in stool indicate
infection not eterotoxin
what is the stomcachs acidity
< 4 pH
kills a lot of bacteria
Achlorhydria - absenece of hydrochloric acid ( stomach not acidic enough )
is gram stain good for stool pathogen ID
no, bc there so many normal flora
travellers diarrhea ( bacteria & parasites )
bacteria
- Enterotoxigenic eschericha coli ( ETEC )
parasitic
- Gardiasis
- entamebiasis
antibiotic associated diarrhea
clostridium difficile
- pseudomembranous
- mild to severe
fecal lactoferrin
neutrophil marker for inflammation
difference between enterotoxin,
invasion of bowel mucosal surface &
invasion of full bowel thickness w/lymphatic spread
enterotoxin
- rapid
- high # water stools = dehydration
- ETEC, vibrio etc.
- viral & parasitic have similar symptoms but last longer
mucosal surface
- RBCs
- WBCs ( inflammation )
- salmonella, campylobacter, shigella, entamoeba histolytica, e.coli
full bowel thickness
- constipation
- RBCs
- WBCs
- often mimics appendicitis
- salmonell typhi
- yersinia enterocolitica (mimics appendicitis )
viral infections
rotavirus ( under 5)
enteric adenovirus ( serotypes 40 & 41)
astrovirus ( v/young & v/old)
highly contagious
campylobacter jejuni
most common cause of gastoenteritis in the world
salmonellla typhi
typhoid fever
blood culture + in 1st week
stool + in 3-4 weeks
shigella
even a low number = major infection ( <100 organisms)
yersinia enterocolitica
self limiting with possible invasion on the mesemteric lymph nodes
- mimics appendicitis
Listeria monocytogenes
- concern when isolated in stool of symptomatic person
Helicobater spp
peptic ulcers
diarrhea : H.cinaedi & H. Fennelliae
aeromonas & plesiomonas shigelloides
watery diarrhea
