Mycobacterium avium

Background

  • Mycobacterium Avium Complex (MAC) refers to species M. avium and M. intracellulare

Clinical Features

  • MAC primarily affects immunocompromised patients
  • Most commonly affects lungs
  • May present as: disseminated infection, lymphadenitis, abscess (cutaneous or brain)

Antibiotic Sensitivities[1]

Category Antibiotic Sensitivity
Penicillins Penicillin G X1
Penicillin V X1
Anti-Staphylocccal Penicillins Methicillin X1
Nafcillin/Oxacillin X1
Cloxacillin/Diclox. X1
Amino-Penicillins AMP/Amox X1
Amox-Clav X1
AMP-Sulb X1
Anti-Pseudomonal Penicillins Ticarcillin X1
Ticar-Clav X1
Pip-Tazo X1
Piperacillin X1
Carbapenems Doripenem X1
Ertapenem X1
Imipenem X1
Meropenem X1
Aztreonam X1
Fluroquinolones Ciprofloxacin X1
Ofloxacin X1
Pefloxacin X1
Levofloxacin X1
Moxifloxacin X1
Gemifloxacin X1
Gatifloxacin X1
1st G Cephalo Cefazolin X1
2nd G. Cephalo Cefotetan X1
Cefoxitin X1
Cefuroxime X1
3rd/4th G. Cephalo Cefotaxime X1
Cefizoxime X1
CefTRIAXone X1
Ceftaroline X1
CefTAZidime X1
Cefepime X1
Oral 1st G. Cephalo Cefadroxil X1
Cephalexin X1
Oral 2nd G. Cephalo Cefaclor/Loracarbef X1
Cefproxil X1
Cefuroxime axetil X1
Oral 3rd G. Cephalo Cefixime X1
Ceftibuten X1
Cefpodox/Cefdinir/Cefditoren X1
Aminoglycosides Gentamicin X1
Tobramycin X1
Amikacin S
Chloramphenicol X1
Clindamycin X1
Macrolides Erythromycin X1
Azithromycin S
Clarithromycin S
Ketolide Telithromycin X1
Tetracyclines Doxycycline R
Minocycline R
Glycylcycline Tigecycline R
Daptomycin X1
Glyco/Lipoclycopeptides Vancomycin X1
Teicoplanin X1
Telavancin X1
Fusidic Acid X1
Trimethoprim X1
TMP-SMX X1
Urinary Agents Nitrofurantoin X1
Fosfomycin X1
Other Rifampin X1
Metronidazole R
Quinupristin dalfoppristin R
Linezolid R
Colistimethate X1

Key

  • S susceptible/sensitive (usually)
  • I intermediate (variably susceptible/resistant)
  • R resistant (or not effective clinically)
  • S+ synergistic with cell wall antibiotics
  • U sensitive for UTI only (non systemic infection)
  • X1 no data
  • X2 active in vitro, but not used clinically
  • X3 active in vitro, but not clinically effective for Group A strep pharyngitis or infections due to E. faecalis
  • X4 active in vitro, but not clinically effective for strep pneumonia

Table Overview

See Also

References

  1. Sanford Guide to Antimicrobial Therapy 2014