Site of Infection
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Usual Causes
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First Choice Treatment (Select antibiotics and dosage)
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Alternative Treatment
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What do you do if the patient is allergic?
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Otitis media
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Pneumococci, Haemophilus influenzae, Moraxella catarrhalis, group A streptococci, Staphylococcus aureus, Enterobacteriaceae
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Sinusitis
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Most common: Streptococcus pneumoniae, H. influenzae, M. catarrhalis.
Others: S. aureus, Streptococcus spp, Neisseria spp anaerobes, and gram-negative rods
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Pharyngitis
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Group A, C, G streptococci, mononucleosis, Corynebacterium diphtheriae, Arcanobacterium haemolyticum, Mycoplasma pneumoniae
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Bronchitis
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Virus; rare M. pneumoniae, Chlamydia
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Acute bronchitis or pneumonia in patient with COPD
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S. pneumoniae, H. influenzae, M. catarrhalis
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Pneumonia, community-acquired
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S. pneumoniae, H. influenzae, S. aureus, Klebsiella pneumoniae, gram-negative bacilli, anaerobes atypical Legionella, M. pneumoniae, Chlamydia pneumoniae, tuberculosis, Pneumocystis
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Diarrhea, traveler's
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Escherichia coli, Shigella, Salmonella, Campylobacter, amebiasis
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Diarrhea, severe
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Shigella, Salmonella, Campylobacter jejuni, E. coli, Clostridium difficile, Entamoeba histolytica
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Diverticulitis
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Enterobacteriaceae, Bacteroides, enterococci
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Gonorrhea
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Neisseria gonorrhoeae
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Urethritis
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Chlamydia trachomatis, Ureaplasma urealyticum
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Syphilis
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Treponema pallidum
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Prostatitis >35 years old
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Enterobacteriaceae
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UTI, uncomplicated
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E. coli
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UTI, complicated
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E. coli, gram-negative bacilli, enterococci, S. aureus, or Staphylococcus epidermidis
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Bite, cat
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Pasturella multocida, S. aureus
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Bite, dog
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Viridans streptococci, Pasteurella multocida, S. aureus, Bacteroides spp, Fusobacterium spp, Capnocytophaga
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Bite, human
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Viridans streptococci, S. epidermidis, corynebacterium, S. aureus, Eikenella, Bacteroides, Peptostreptococcus
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Erysipelas
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Group A Streptococcus, S. aureus
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Impetigo
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Group A Streptococcus, impetigo
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Infected postoperative wound
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S. aureus, Group A streptococci, Enterobacteriaceae
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Lyme disease
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Borrelia burgdorferi
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