50 Microorganisms

Question 1

Examples of Gram-positive bacili that are associated with food contamination/spoilage

Answer 1

1) Bacillus cereus
2) Clostridium botulinum
3) Clostridium sporogenes

Question 2

Probiotic Gram-positive bacili; can be found in commercial probiotic drink [e.g. yakult]

Answer 2

1) Lactibacillus case strain Shirota
2) Bifidobacterium breve strain Yakult

Question 3

Lactic acid bacterium (Gram Positive bacilli); associated with various fermented foods

Answer 3

1) Lacticaseibacillus casei (Cheese)
2) Lactobacillus fermentum (Sourdough)
3) Lactiplantibacillus plantarumu (Milk products)
4) Exiguobacterium spp. (Lactate Production)

Question 4

Industrial Lactate Production

Answer 4

Exiguobacterium spp.

Question 5

Soy Sauce (Gram Positive other shapes)

Answer 5

1) Staphylococcus condimenti
or
2) Tetragenococcys halophilus

Question 6

Gram Positives (other shape) associated with fermented foods

Answer 6

1) Staphylococcus saprophyticus (Cheese)
2) Staphylococcus simulans (Meat Sausage)
3) Staphylococcus condimenti (Soy sauce)
4) Tratragenococcus halophils (Soy Sauce)
5) Weisella koreensis (Kimchi)
6) Streptococcus gallolyticus (Cheese)
7) Streptococcus salivarius (Dairy Yogurt)
8) Streptococcus thermophilus (Cheese)
9) Streptomyces griseus (Meat)
10) Weisella sp. (Fermented Foods)

Question 7

Gram negative bacteria, associated with food spoilage and other gastrointestinal infections from contaminated food

Answer 7

1) E. coli
2) S. enterica ser. Typhi
3) S. enterica ser. Enterica
4) Shigella spp.
5) Yersinia enterocolitica
6) Yersinia pseudotuberculosis
7) Citrobacter freundii
8) Listeria monocytogenes
9) Listeria aquatica
10) Listeria newyorkensis

Question 8

Zoonotic in nature, spread from contaminated meat. Other gram negative shape

Answer 8

1) Brucella abortus
2) Brucella suis
3) Coxiella burnetii

Question 9

Gram negative bacterium, associated with acetic acid production

Answer 9

Acetobacter aceti

Question 10

Gram negative (other shapes) that are found to be associated with gastrointestinal infections from eating contaminated food

Answer 10

1) Campylobacter jejuni
2) Vibrio parahaemolyticus
3) Vibrio cholerae
4) Vibrio vulnificus
5) Pleisiomonas shigelloides

Question 11

Yeast/Fungi with significant relation to food production

Answer 11

1) Saccharomyces cerevisiae (Wine Fermentation)
2) Penicillium camemberti (Cheese)
3) Penicillium roqueforti (Cheese)
4) Rhizopus oryzae (Fermentation)
5) Trichoderma reesei (Cellulase)
6) Neurospora crassa (Cheese)
7) Mucor miehei (Cheese)
8) Geotrichum candidum (Cheese)

Question 12

Fungal/Yeast Contaminant

Answer 12

1) Aspergillus niger
2) Candida albicans
3) Fusarium spp.