Flashcards in microbiology Deck (59)
food borne cause of fever, abdominal pain and diarrhea; both kids and adults
most common cause of viral gastroenteritis in infants/children; can lose fluids and become dehydrated
hemolytic-uremic syndrome in kids
watery diarrhea in immunocompromised adults by cryptosporidium
congenital infection that is present with meningitis and sepsis at birth -- food or water borne
common cause of diarrhea in adults
dysentery with bloody diarrhea
massive fluid loss
what is the agent that is associated with duodenal peptic ulcers?
found in raw shellfish
invasive; extraintestinal infection
staph aureus causes food poisoning through...
food poisoning through elaboration of an enterotoxin that causes explosive diarrhea within 2 hrs of ingestion
colonic mucosal invasion with exudate and ulceration; stool with blood and mucus
self limited diarrhea with following liver abscess(via submucosal invasion --> veins --> portal system --> liver)
Special defenses of saliva
and organisms with a resultant tactic?
secretory IgA in saliva that selectively inhibits adherence of bacteria
Neisseria gonorrhœae (which causes gonorrhea), Strep pneumoniae, and Haemophilus influenzae type B all releases a protease that destroys IgA.
small intestine defenses
flow of liquids
shedding of epithelium
cells that are only in the ileum
-- they sample antigen, initiate immune response in the mucosa, and activate T and B cells
body flora increase in numbers with...
distance from stomach
(few in esophagus or stomach)
common oral flora
diptheroids (nonpathogenic corynebacteria),
spirochetes (treponema denticola),
B-hemolytic strep groups vs a-hemolytic strep groups
B - complete hemolysis
---pyogenes or agalactiae
a - partial hemolysis
---pneumoniae or viridans
a-streptococci types that is abundant in flora of mouth? throat?
viridans is more common in mouth
pneumoniae is more common in the pharynx/throat
streptococci with no defined Lancefield group antigens (Lancefield classification is based on carbohydrate antigens on the bacterial surface); normal flora of the respiratory tract but can cause dental caries, bacterial endocarditis, and other disorders in immunocompromised hosts.
6 types of strep viridans
• S. mutans = dental caries
• S. mitis = cheek region
• S. sanguinis, no preference of locations
• S. salivarius = dorsal side of the tongue
• S. salivarius ssp. thermophilus
• S. constellatus, occasional human pathogen,
the strep of dental caries
strep of cheek region?
strep of dorsal side of tongue?
Gram-positive facultative anaerobic or microaerophilic rod-shaped bacteria. They are part of the lactic acid bacterial group, whose members convert lactose and sugars to lactic acid. In humans they are present in the vagina and the GI tract. They are typically benign, except in the mouth where they are associated with cavities/dental caries.
requires bacteria to occur but that alone is not sufficient --> genetics and environment also play a role
periodontitis due to diabetes mellitus --
periodontitis with cardiovascular disease --