Bacteriology Flashcards
Catalase positive
Staphylococcus
Catalase negative
Streptococcus & others
Coagulase positive
S. aureus
Coagulase negative
CNSS
Grouping method for Streptococci
Lancefield grouping
Group A Strep.
Strep. pyogenes
Group B Strep.
Strep. agalactiae
Group D Strep.
Enterococci, Strep. bovis, Strep. suis
Which haemolytic pattern do group A & B streptococci demonstrate?
beta hemolytic
Which haemolytic pattern does Viridans Streptococci demonstrate?
alpha hemolytic
Which haemolytic pattern does Streptococcus pneumoniae demonstrate?
alpha hemolytic
Which haemolytic pattern does S. aureus demonstrate?
beta hemolytic
Incubation period for S. aureus gastroenteritis
1~6 hours
Abx for MSSA
Cloxacillin
Abx for MRSA
IV vancomycin
Abx for Staphylococcus saprophyticus
Penicillin
Major symptoms of rheumatic fever in Jones criteria (6)
fever, pancarditis, migratory polyarthritis, chorea, subcutaneous nodules, erythema marginatum
Which disease causes erythema marginatum?
Rheumatic fever
Post-streptococcal diseases (2)
Rheumatic fever, post-streptococcal glomerulonephritis
Which antibiotics do Enterococcus spp. resistant to? (2)
cephalosporins, vancomycin (emerging)
Which Streptocci transmits disease by zoonosis and is thus notifiable?
Streptococcus suis
Streptococcus that shows diplococci under microscope (2)
Streptococcus pneumoniae, Enterococcus
Transmission of Bacillus anthracis
cutaneous, pulmonary, GI
Pathogen for woolsorter’s disease
Bacillus anthracis
Pathogen once as bioterrorism agent, being spores in envelope
Bacillus anthracis
Pathogen secreting 2 forms of enterotoxins (pathogen + 2 enterotoxins)
Bacillus cereus. Emetic form & diarrheal form
Pathogen for fried rice syndrome
Bacillus cereus
Spore-forming gram positive bacilli (2 genus)
Bacillus spp., Clostridium spp.
Non-spore-forming gram positive bacilli (3)
Corynebacterium diphtheriae, Listeria monocytogenes, Actinomyces spp.
Bacteria that produces acid in vagina to inhibit other pathogens
Lactobacillus
Bacteria as probiotics to treat paediatric diarrhoea
Lactobacillus
Properties MacConkey plate is differentiating and the corresponding colour
lactose fermenter (red), others (yellow)
Lactose fermenters (3)
Klebsiella, Escherichia coli, Enterobacter
Agar for Escherichia coli O157:H7
Sorbital MacConkey agar
Name of XLD agar.
Properties XLD agar is differentiating and the corresponding colour.
Xylose lysine deoxycholate agar
Shigella (xylose non-fermenter, red), Salmonella (H2S producer, red with black spots), others (xylose fermenters, yellow)
Agar for Vibrio spp.
TCBS agar +/- alkaline peptone enhancement
Properties TCBS agar is differentiating and the corresponding colour
sucrose fermentation
Vibrio cholerae (yellow (F)), Vibrio parahaemolyticus (green (NF))
Kidney bean-shaped diplococci
Neisseria spp.
Which Neisseria is glucose fermenting only?
Neisseria gonorrhoeae
Which Neisseria causes neonatal conjunctivitis?
Neisseria gonorrhoeae
Agar for Neisseria species (2)
Chocolate agar, Thayer Martin agar
Which Neisseria is found in nasopharynx normally?
Neisseria meningitidis
Which Neisseria is both glucose and maltose fermenting?
Neisseria meningitidis
Which bacteria require rifampicin for close contacts as prophylaxis? (2)
Neisseria meningitidis, Haemophilus influenzae
Abx prophylaxis for close contact of Neisseria meningitidis
Rifampicin / ceftriaxone / ciprofloxacin
Strains of Neisseria meningitidis that are targeted by vaccination
A, C, Y, W135 (B for teens)
GN cocci shown as coccobacilli
Moraxella catarrhalis
Enterobacteriaceae (9)
Escherichia coli, Klebsiella, Enterobacter, Serratia, Citrobacter, Proteus, Shigella, Salmonella, Yersinia
Oxygen tolerance of Enterobacteriaceae
facultative anaerobes
Biochemistry of enterobacteriaceae (glucose, oxidase)
glucose fermenter, oxidase negative
3 antigens for enterobacteriaceae
O (component of LPS), K (capsule), H (flagella)
Pathogen as indicator of fecal contamination in water
Escherichia coli
Pathogen with watery capsule, giving mucoid colonies in culture
Klebsiella
Non-motile enterobacteriaceae
Klebsiella, Shigella
Pathogen showing clear orange colonies
Serratia
Pathogen fermenting citrate
Citrobacter
Pathogen swarming on agar surface
Proteus
GNR producing urease (3)
Proteus, Helicobacter pylori, Klebsiella
Pathogen for staghorn stone / struvite stone
Proteus
Pathogen for bacillary dysentery
Shigella
Most pathogenic Shigella
Shigella dysenteriae
Least pathogenic Shigella
Shigella sonnei
Enterobacteriaceae that is a xylose non-fermenter
Shigella
Enterobacteriaceae that produces H2S (2)
Salmonella, Proteus
Pathogens for typhoid fever (2)
Salmonella typhi, Salmonella paratyphi
GN bacteria family that are in comma shape and halophilic
Vibrionaceae
Serogroups of Vibrio cholerae (3)
O1 classical, O1 El Tor, O139 Bengal
Leading cause of diarrhoea in Japan
Vibrio parahaemolyticus
Seagull shaped pathogen
Campylobacter jejuni
Pathogen best grown at 42 degree Celsius and is microaeropilic
Campylobacter jejuni
Pathogen giving “tear-drop” colonies in Skirrow medium
Campylobacter jejuni
Culture medium for Campylobacter jejuni
Skirrow medium
Microaerophilic GNR (2)
Campylobacter jejuni, Helicobacter pylori
Pathogen producing pyoverdin and pyocyanin
Pseudomonas aeruginosa
Pathogen producing sweet grape-like scent
Pseudomonas aeruginosa
Coccobacillary GNB (3)
Moraxella catarrhalis, Acinetobacter baumannii, Haemophilus influenzae
Non-motile MDR GNR
Acinetobacter baumannii
Growth requirement of Haemophilus influenzae
X factor (haemin), V factor (NAD)
Culture methods for Haemophilus influenzae (2)
Chocolate agar, Satellitism (with S. aures)
Most virulent serotype of Haemophilus influenzae
b
Pathogen for pertussis
Bordetella pertussis
Agar for Bordetella pertussis
Bordet-Gengou agar