Reference cards, M to O

MacConkey agar concept Lab method · Lactose-fermentation sorting vocabulary

Macrolides Antimicrobial · 50S protein-synthesis class concept

Malaria Disease · Anopheles-borne cyclic fever with hemolysis

Malassezia furfur Fungus · Lipophilic yeast of tinea versicolor

MALDI-TOF MS Lab method · Protein fingerprint ID concept

Marburg virus Virus · Filovirus, cave/mine bat exposure, VHF

Measles Disease · Rubeola: 3 C's, Koplik spots, descending rash

Measles virus Virus · Enveloped negative-sense RNA paramyxovirus

Methyl red / Voges-Proskauer test Lab method · MR+ E. coli vs VP+ Klebsiella

Metronidazole Antimicrobial · Anaerobe/protozoa DNA-damage concept

Minimum inhibitory concentration Lab method · MIC susceptibility vocabulary

Molluscum contagiosum virus Virus · Umbilicated papules from a poxvirus

Monobactams (aztreonam) Antimicrobial · Monocyclic beta-lactam, Gram-negative only

Moraxella catarrhalis Bacterium · Oxidase-positive Gram-negative diplococcus

Morganella morganii Bacterium · Urease- and indole-positive nosocomial enteric rod

Motility test concept Lab method · Diffuse growth from the stab = motile

MRSA Concept · Methicillin-resistant S. aureus vocabulary

Mucor/Rhizopus group Fungus · Broad aseptate/pauci-septate hyphae clue

Mumps virus Virus · Parotitis, orchitis, aseptic meningitis

Mycobacterium avium complex Bacterium · Nontuberculous mycobacteria; disseminated in advanced HIV

Mycobacterium leprae Bacterium · Acid-fast leprosy bacillus (cannot be cultured)

Mycobacterium marinum Bacterium · Photochromogen of fish-tank granuloma

Mycobacterium tuberculosis Bacterium · Acid-fast rod

Mycoplasma pneumoniae Bacterium · No cell wall atypical bacterium

NAAT Lab method · Nucleic acid amplification test concept

Naegleria fowleri Parasite · Freshwater brain-eating free-living amoeba

Necrotizing fasciitis Disease · Rapidly spreading deep fascial infection

Neisseria gonorrhoeae Bacterium · Oxidase-positive Gram-negative diplococcus

Neisseria meningitidis Bacterium · Gram-negative diplococci

Neuraminidase inhibitors Antimicrobial · Block influenza virion release

Nitrate reduction test Lab method · Red after reagents = nitrate reduced

Nitrofurantoin Antimicrobial · Reactive-intermediate urinary agent

Nocardia species Bacterium · Branching weakly acid-fast aerobic rods

Normal flora / microbiota Concept · Resident microbial community concept

Norovirus Virus · Nonenveloped positive-sense RNA GI virus

Nucleoside analog antivirals Antimicrobial · Fake nucleosides cause chain termination

Onchocerca volvulus Parasite · River blindness from blackfly bites

Optochin test Lab method · P-disk: pneumococcus sensitive, viridans resistant

Oxazolidinones (linezolid) Antimicrobial · 50S initiation-complex inhibitor for Gram-positives

Oxidase test Lab method · Cytochrome c oxidase clue

Oxygen requirement classes Concept · How bacteria relate to oxygen