Overview of Bacteria

From WikiLectures

Text intended for repetition for microbiology exam.

Gram-negative Bacteria[edit | edit source]

Genus Species Properties Culture agar Pathogenicity Transmission Disease Diagnostics Therapy
Helicobacter pylori microoxyphilic, mobile, G-, rods, ferments AMK, not carbohydrates chocolate agar,

Thayer-Martin (3-7days)

adhesins, flagella, urease fecally-orally acute gastritis,

chronic gastritis

microscopy (HE, Gram, Warthin-Starry), cultivation, urease test, breath test, serology AMO + KLA

H+ pump inhibitor / AMO + MET + bismuth

Legionella spp., pneumophilica mobile, aerobic, G-, slender rods, pleomorphic, two flagella, catalase positive BCYE (buffered charcoal yeast extract) - 2,3-dihydroxy fatty acids, week, CO2,

25–43 °C

hemolysin, cytotoxin, endotoxin, DNase inhalation,

not from humans, reservoir standing water

pneumonia,

pontic fever,

legionary fever

ERY + RIFAMPI / CIPROFLOX / OFLOX,

not β-lactam

Bordetella pertussis  G-, immobile ovoid short rods, obligate aerobe, ferments amino acids, not carbohydrates, requires NAD, virulent strains hemolyzes, bipolar metachromatic granule (toluidine blue) Bordet-Gengou (penicillin present) filamentous haemagglutinin, pertussis toxin, haemolysin,… droplets,

reservoir human

whooping cough (last stage in the absence of bacteria) direct fluorescence (nasopharyngeal aspirate), PCR, Ig-ELISA (control only, positive in later stages), culture insensitive (point of care inoculation), non-specific microscopy supportive treatment of respiratory epithelial damage, bacteria are no longer present in the late stages

(ATB unnecessary)

Haemophilus spp. small immobile non-sporulating pleomorphic rods, facultatively aerobic, capnophilic, G- chocolate agar, Levin's agar (Staphyloccocus aureus; satellite growth), needs NAD (P) and hemin (factors X and V) meningitis, epiglottitis, arthritis, sinusitis, otitis, pneumonia, conjunctivitis, Brazil purple fever, chancroid in the Czech Republic β-lactam (foreign strains tend to be resistant), amoxicillin, cotrimoxazole
G- Bacteria Overview

Gram-positive Bacteria[edit | edit source]

G+ Bacteria Overview


Links[edit | edit source]

References[edit | edit source]

  • MUDR. ADÁMKOVÁ, . Gram-negative non-fermenting sticks and cocci [lecture for subject microbiology, specialization general medicine, 1.LF UK]. Prague. 15-10-2010. 

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