Chain of Infection

Question 1

Infectious agent examples

Answer 1

bacteria
viruses
fungi
protozoa
(can include resident or transient flora)

Question 2

Reservoir

Answer 2

a place where microorganisms survive, multiply, and await transfer to susceptible host

Question 3

Reservoir examples

Answer 3

humans
animals
insects
food
water
organic matter on inanimate surfaces (fomites)

Question 4

Portal of exit examples

Answer 4

blood
skin and mucous membranes
respiratory tract
genitourinary tract
gastrointestinal tract
transplacental (mother to fetus)

Question 5

Modes of transmission examples

Answer 5

direct contact (person to person)
indirect contact (person to inanimate object)
droplet >5 μm
airborne <5 μm
vehicles (inanimate object)
vectors (bug)

Question 6

Portal of entry examples

Answer 6

blood
skin and mucous membranes
respiratory tract
gastrointestinal tract
genitourinary tract
transplacental (mother to fetus)