Infx Dz Flashcards
botulism sx
symmetric descending flaccid paralysis
12-36h after exposure
dec or absent DTR
D: diplopia, dilated fixed pupils, dry mouth, dysphasia, dysarthria, dysphonia, dec DTR, descending
urinary retention
botulism etiology
toxin inhibits Ach release
botulism tx
antitoxin
CDC
abx only in wound botulism: Pen G
infant botulism sx
constipation
symmetric descending paralysis (floppy baby)
poor gag reflex, pooled oral secretion
poor feeding, diminished suck, dec vision
infant botulism tx
IV botulism IG: equine if <1yo, human if >1yo
avoid honey during first year of life
gas gangrene etiology
clostridium perfringens
traumatic injury or IVDU
gas gangrene sx
sudden onset pain and edema, shock
brown/blood tinged watery exudates w/ skin discoloration around area
crepitus/gas in tissue on PE
gas gangrene tx
IV penicillin + IV clindamycin, debridement
listeriosis found in
deli meat
unpasteurized dairy
listeriosis sx
bacteremia in infants <2mo and elderly
pregnancy: associated w/ premature labor and stillbirth
listeriosis tx
IV ampicillin TOC
anthrax CXR
widening of mediastinum
anthrax tx
ciprofloxacin for tx and exposure
MC bacterial diarrhea in US
campylobacter jejuni
campylobacter jejuni complications
GBS
reactive arthritis
campylobacter jejuni sx
frequent bloody watery diarrhea
N/V/F
gold standard campylobacter jejuni
stool culture
campylobacter jejuni tx
supportive
severe: azithromycin
chlamydia etiology
C. trachomatis
chlamydia tx
azithromycin single dose or doxy
pregnant/sx: PCN/cephalosporin. test of cure after 3wks
chlamydia conjunctivitis in neonate tx
PO erythromycin: associated w/ pyloric stenosis in infants
neonatal chalmydia pneumonia sx
infant between 3-16wks old
gradual staccato cough
afebrile
pharyngitis, sinusitis
neonatal chlamydia pneumonia tx
1st line: macrolide (azithromycin)
2nd line: doxy
cholera type of diarrhea
non inflammatory
cholera sx
watery diarrhea w/ mycys
rice water stools
fever rare
cholera definitive test
stool culture
cholera tx
supportive
mod-sev: cipro or doxy, azithromycin if child or pregnant
diptheria sx
URI sx, low fever
bull neck, cervical lymphadenopathy
grey pseudomembrane on pharynx (grains of salt, bleed when scraped)
myocarditis: arrhythmia/heart failure
diptheria confirm test
pharyngeal cultures
diptheria tx
hospital and isolation
ASAP equine serum antitoxin
IM PCN G or PO/IV erythromycin
diptheria prophylaxis
penicillin benzathine G or erythromycin
DTap schedule
5 doses: 2mo, 4mo, 6mo, 5-18mo, 4-6yo
booster at 11yo
gonorrhea tests
NAAT
gram stain and culture: gr negative diplococci
gonococcal tx
uncomplicated: ceftriaxone IM and azithromycin PO (for chlamydia)
complicated: sub in doxycycline
fitz- hugh curtis syndrome
disseminated acute peri hepatitis
gonococcal urethritis tx
ceftriaxone IM and azithromycin PO (or doxy)
HUS caused by
E. coli O157:H7 (shiga like toxin)
HUS sx
MC in children <5yo
abd pain, N/V
bloody diarrhea, seizures
MCC acute kidney injury in children
HUS
HUS labs
triad: hemolytic anemia, renal failure, thrombocytopenia
HUS tx
supportive
avoid ABX
MRSA bacteria shape
gram positive bacteria cocci in cluster
MRSA tx
isolation
tx for both sx and no sx
vancomycin or linezolid first line
psittacosis MCC
parrot fever
chlamydia psittaci
h/o bird exposure
psittacosis sx
high fever
HA, myalgia
nonproductive couth
HEPATOSPLENOMEGALY
psittacosis CXR
patchy peri-hilar or lower lobe infiltrates
psittacosis tx
supportive and first line: doxy
2nd line: azithromycin (kids or pregnant)
RMSF etiology
rickettsia rickettsia: gr negative coccobacilli
RMSF sx
abrupt onset, severe HA, N/V/F
maculopapular rash on palms and soles –> petechiae
RMSF test confirm
skin bx
RMSF complications
encephalitis
myocarditis
pulmonary edema
RMSF tx
doxy, even in children
chloramphenicol if pregnant or AE
chloramphenicol AE
gray baby syndrome in 3rd trimester
MCC of osteomyelitis in children w/ sickle cell
salmonella
salmonella sx
fever, bloody diarrhea
pea soup
typhoid salmonella sx
bradycardia
hepatosplenomegaly
rose colored rash
salmonella tx
rehydration
severe: ciprofloxacin, FQ
shigella sx
high fever
watery bloody mucoid diarrhea
seizures
dehydration
shigella tx
FQ adults
azithromycin in kids
avoid anti motility
complication of shigella
bacteriemia
sepsis
HUS
reactive arthritis
seizures
Q fever etiology
coxiella burnetii
from sheep, goats, wool
Q fever sx
Acute: pneumonia. severe HA, hepatitis, or encephalopathy
chronic: culture neg endocarditis. persistent low grade fever, rash (septic thromboembolism)
Q fever test
acute: immunofluorescence IFA MC
chronic: phase I IgG immunoglobulins
Q fever tx
doxycycline TOC
rifampin for chronic disease
plague etiology
yersinia pestis
infected rodents and their fleas
bubonic plague sx
MC form of plague
swollen, warm, red, painful nodes in groin, axilla, and cervical regions (buboes)
septicemic plague sx
DIC: extensive purpura (Black Death)
gangrene (acral): distal extremities, nose, penis
no buboes
pts die from pneumonia or meningitis
pneumonic plague sx
tachypnea, cyanosis
productive cough
frothy blood tinged sputum
red death
plague gram stain
bipolar staining: safety pin appearance of organisms
plague tx
streptomycin or gentamicin 1st line
doxycycline 2nd line
plague post exposure prophylaxis
doxycycline or tetracycline
Bactrim alternative
tetanus etiology
clostridium tetani
gram + rod
tetanus prevention
Tdap
tetanus sx
risks sardonicus: joker smile
opisthotonos: arched back
trismus: lock jaw
descending paralysis
inc DTR
spatula test
tetanus: touch oropharynx causes reflex biting d/t masseter spasm
tetanus tx
metronidazole or single IM dose of human tetanus IG
alternative: Pen G
benzo (diazepam) to decrease spasms
tetanus prophylaxis
prior immunization >3 doses, uncertain, or <3 doses: dT if low risk wound and >10y since last dose
high risk wound: dT if >5y since last dose + 25ou IM TIGa
cryptococcus CD4
<100
MCC fungal meningitis in immunocomp adults
cryptococcus
cryptococcus sx
meningitis
N/V
photophobia
histoplasmosis sx
flu like sx —> pneumonia
secondary infx w/ TB like sx
histoplasmosis CXR
hilar/mediastinal lymphadenopathy
patchy nodular pulmonary infiltrates
occasional cavitations
histoplasmosis labs
inc ESR
anemia, pancytopenia
tissue bx: granulomas, fungi visualization
histoplasmosis tx
itraconazole or amphotericin B
CS
pneumocystis CD4
<200
pneumocystis pathogen
pneumocystis jiroveci (PCP)
pneumocystis sx
gradual fever, dyspnea on exertion
dry cough, wheezing, SOB
hypoxia w/ ambulation
pneumocystis test
BIT: sputum culture
CXR: bilateral diffuse infiltrates, bat wing appearance, ground glass opacities, apical regions spared and progress peripherally
inc LDH
+ silver stain
pneumocystis definitive test
bronchoalveolar lavage
pneumocystis tx
bactrim TOC
dapsone if allergic
prednisone if hypoxic
pneumocystis prophylaxis HIV tx
bactrim
M. Avium intracellular (MAC)
atypical mycobacterial disease MC assoc w/ AIDS
M. avium (MAC) sx
fever, swollen lymph nodes
diarrhea, fatigue, WL, SOB
African trypanosomiasis
African sleeping sickness: tsetse fly
painless chancre at bite signs, winter bottom sign (posterior cervical lymphadenopathy)
daytime sleepiness followed by nighttime insomnia
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