Lecture 20

Question 1

Period of incubation

Answer 1

the time it takes for the organism to grow/increase in load before symptoms are visible

Question 1

the 6 “F’s” of transmission

Answer 1

fingers

flies

fomites

food

phlegm

fun

Question 1

Can fingers be active vectors or are they only passive?

Answer 1

they can be active such as when open sores from syphilis are on them

Question 1

Give examples of breaking the link in transmission

Answer 1

• pasturizing milk to get rid of the pathogenic TB bovis organisms
• washing hands after using bathroom
• using a condom to stop the spread of STDs

Question 3

Fomites

Answer 3

inanimate objects which spread disease

Question 4

Portal of entry

Answer 4

the disease has to get into your body in the correct way to cause disease

Question 4

Invasiveness

Answer 4

when the organism grows and/or eats through your tissues and damages them

Question 6

Active carrier

Answer 6

carrier has the disease and it is growing

Question 8

Reservoirs of infection

Answer 8

all active biological vectors, and some nonliving

provides a means of survival, growth, and transmission for the organism

Question 9

Transmission

Answer 9

organism has to get into you in order to cause disease

Question 10

Which is more dangerous: passive or active biological vectors?

Answer 10

Active because the microbe grows inside the vector which increases the load of the organism and its virulence (whereas load in a passive vector may actually decrease over time such as poop on a sidewalk in the sun)

Question 11

ID50

Answer 11

the infectious dose required to infect 50% of individuals

Question 12

What percentage of micro aerosols are pathogenic? Non-pathogenic?

Answer 12

4% pathogenic

96% non-pathogenic

Question 13

What does immunizing biologicals mean?

Answer 13

using vaccines

Question 14

Portals of exit

Answer 14

how and when the organism leaves the body

Question 16

Signs and symptoms

Answer 16

your reactions to the growth of the organism such as fever, headache, vomiting, rash, death

Question 17

Vehicles

Answer 17

are dead, can transmit the disease, can be passive or active

Question 18

Passive/mechanical

Answer 18

organism is carrying the disease but it hasn’t been infected

Question 19

Name the 3 ways to control infectious diseases

Answer 19

1. elimination of reservoir
2. breaking the link in transmission
3. immunizing biologicals

Question 20

Vectors

Answer 20

vectors are alive, can transmit the disease, can be passive or active