Normal Microbiota Dr. Pettit

Question 1

Streptococcus pneumonia

Answer 1

Gram +
nasopharynx
5-40% population colonized at this site; known for its capsule

Question 2

Streptococcus mutans

Answer 2

Gram +
mouth
produces acids that demineralize enamel

Question 3

Propionibacterium acnes

Answer 3

hair follicles, sebaceous glands

produces propionic acid which contributes to stinky feet

Question 4

Clostridium difficil

Answer 4

Gram +
colon
2-10% healthy adults colonized, 20-50% hospitalized adults colonized; forms endospores

Question 5

Heliocobacter pylori

Answer 5

stomach

makes its environment hospitable by raising the pH

Question 6

Bacteroides

Answer 6

Gram -
colon
dominant genus in this site; growth stimulated by bile

Question 7

Lactobacillus

Answer 7

vagina

major protection against vaginosis

Question 8

Staphylococcus aureus

Answer 8

Gram +
nose
30% population colonized at this site; hardy, relatively resistant to desiccation, salt, acid; produces many toxins

Question 9

Staphylococcus epidermidis

Answer 9

Gram +
skin
hardy, relatively resistant to desiccation, salt, acid

Question 10

Escherichia coli

Answer 10

Gram -
colon
member of the enterobacteriaceae; synthesizes vitamin k

Question 11

Candida albicans

Answer 11

vagina

budding yeast; overgrowth with oral antibiotics