Principles of Infectious Diseases Flashcards
Common organisms in alcoholics
Strep pneumonia, klebsiella pneumonia, staph aureus
Common organism in post-viral infections
staph aureus
Which bacteria does not have a cell wall?
mycoplasma
What are the atypical organisms?
Chlamydia, Legionella and Mycoplasma pneumoniae
What are some common anaerobes?
Bacteroides, Clostridium, Enterobacter, Lactobacillus
What are the encapsulated bacteria?
Strep pneumo
h.influenza
klebsiella
neisseria
cellulitis (staph aureus or epidermidis)
DOC - dicloxacillin (allergy - clindamycin)
alt. cephalexin
cellulitis (strep pyogenes)
DOC - PCN (allergy - erythromycin)
alt. cephalexin
diarrhea - bacillus cereus
food poisoning (reheated fried rice) Tx: supportive
diarrhea - campylobacter jejuni
fecal-oral (contaminated water) or unpasterized milk
DOC - azithromycin
diarrhea - clostridium botulinum
honey (young kids), canned foods
Tx: trivalent antitoxin
diarrhea - c.diff
nosocomial or abx associated
DOC - metronidazole or oral vanc
bloody diarrhea - e.coli
uncooked beef
Tx: supportive
diarrhea - enterotoxigenic e.coli
“traveler’s diarrhea” due to production of toxins
DOC - fluoroquinolones
bloody diarrhea - shigella
DOC - AMP
“rice water diarrhea” (vibrio cholorae)
contaminated water and seafood
Tx: fluid, glucose + Na (gatorade)
DOC - doxyclycline or fluoroquinolone
diarrhea - CMV
immunocompromised
DOC - ganciclovir
diarrhea - Norwalk virus
cruise ships, spreads fast!
Tx: supportive
diarrhea - rotovirus
children
Rotazyme test
Tx: fluids +/-nitazoxanide (antiprotazoal)
diarrhea - salmonella
raw poultry, eggs, meats
DOC - AMX
diarrhea - giardia lamblia
protozoa
day care, hikers, anal-oral MSM
check stool antigen
DOC - tinidazole or nitazoxanide
diarrhea - enterobius vermicularis
helminth
most common in US
eggs deposited outside anus (itching)
DOC - albendazole
Most common bacteria for UTIs (ambulatory adults)
e.coli (up to 80%)
klebsiella/proteus (about 10%)
What are the infections in ToRCHeS?
Toxoplasmosis, Other (Listeria, e.coli, GBS), Rubella, CMV, HIV, HSV type 2, Syphilis
MRSA treatment (IV)
Vancomycin
Telavancin
Daptomycin
Linezolid
MRSA treatment (PO)
Minocycline Doxycycline TMP/SMX Clindamycin Linezolid
Pseudomonas treatment (IV)
Piperacillin
Ticarcillin
Ceftazidime (Fortaz) 3rd gen Ceph
Cefepime 4th gen Ceph
Pseudomonas treatment (PO)
Cipro
Levo
What are the bacteriostatic antibiotics?
“We’re ECSTaTiC about bacteriostatics!”
E-mycin, Clindamycin, Sulfamethoxazole, Trimethoprim, Tetracyclines, Chloramphenicol
What are the bacteriocidal antibiotics?
“Very Finely Proficient At Cell Murder”
Vancomycin, Fluoroquinolones, PCN, Aminoglycosides, Cephalosporin, Metronidazole
What type of cells are needed to generate high affinity antibodies against strep pneumo?
helper T lymphocytes
What drugs are used to treat atypicals?
Macrolides (clarithromycin…)
FQs (Azithromycin…)
Tetracyclines
3rd generation cephalosporin with pseudomonas coverage?
Ceftazimine (Fortaz)
What is the likelihood PCN allergic patients are also cross-sensitized with cephalosporins?
5-10%
warrants close observation or possible alternative
Which bacteria is most commonly seen in animal bites?
Pasteurella multicoda
Most common CAP?
Mycoplasma pneumo ( b/c feel fine and out and about)
What is the resistance mechanism for encapsulated bacteria?
Capsule helps bacteria evade the immune system.
What makes atypicals unique?
They are IN the cell. Don’t show up on gram stain and must use abx that penetrates.
Strep agalactiae AKA
GBS (mostly babies)
What bug is associated with infected caths and prosthesis?
Staph epidermidis
What bug is associated with rigorous sex and multiple partners?
Staph saprophyticus
What bug is of concern in meningitis in very young and old?
Listeria (add amp)
Which bug causes “floppy baby”?
C. Botulinum
Which macrolide can cause c.diff?
Clindamycin
C.diff - DOC
#1 metronidazole 500 mg PO TID x 3 wks (1st-2nd episode) #2 vanc 500 mg PO QID (severe) +/- metro IV if inflamed colon or ileus
Which abx get good intra cellular penetration?
Macrolides - azithromycin, clindamycin, erythromycin
Telithromycin
FQ
Tetracycline (doxy)
Which bug is most common in post-viral illness?
Staph aureus
Strep pneumonia AKA
Alpha hemolytic strep
Strep pyogenes AKA
GABHS
4th generation cephalosporin with pseudomonas coverage
Cefepime