PUBH Exam 3 Practice Questions and
All Correct Answers 2025-2026
Updated.
Difference between infectious and non-infectious disease? - Answer Infectious diseases are
caused by pathogenic organisms
Non-infectious disease are any disease not caused by a pathogen
Why are infectious diseases a public health concern? - Answer They are a leading cause of
death (especially in children in low-income countries)
There are still emerging diseases that need to be researched
Rise of strain + antibiotic resistance
Difference between infectious and communicable diseases? - Answer The only criteria for
infectious disease is that it is caused by a pathogen
Communicable diseases are infectious diseases that spread rapidly and easily (AKA infectivity)
Contagious: extra communicable
3 parts of EPI triad? - Answer Host
Agent
Environment
3 most common agents? - Answer Bacteria
Viruses
Fungi
6 characteristics of an agent? - Answer Infectivity
Pathogenicity
Virulence
Immunogenicity
Antigenic stability
Survival
Vectors vs non-vectors? - Answer Vectors are organisms that carry a parasite/pathogen from
host to host - asymptomatic carriers
Mosquitos carrying malaria from person to person (Mosquito = Vector)
, Non-vectors are humans, birds, bats and other vertebrates
Environment characteristics that increase risk of disease? - Answer Physical, biological, social
economic:
Weather
Housing
Geography
Occupational setting
Air/water quality
Food
What are the five sites of infection? (On your body) - Answer Eyes
Digestive Tract
Mouth + nose
Skin
Genitals + urinary tract
5 examples of direct route of transmission? - Answer Skin to skin
Sneeze/cough
Breast milk
Mucous-mucous
Across placenta
4 examples of indirect route of transmission? - Answer Food borne
Water borne
Vector borne
Airborne (cold germs living on a door knob)
What is an agent? - Answer a factor that causes or contributes to a health problem or
condition
What is a host? - Answer person or animal susceptible to the pathogen
Natural reservoir
6 characteristics that increase risk for host? - Answer Age
All Correct Answers 2025-2026
Updated.
Difference between infectious and non-infectious disease? - Answer Infectious diseases are
caused by pathogenic organisms
Non-infectious disease are any disease not caused by a pathogen
Why are infectious diseases a public health concern? - Answer They are a leading cause of
death (especially in children in low-income countries)
There are still emerging diseases that need to be researched
Rise of strain + antibiotic resistance
Difference between infectious and communicable diseases? - Answer The only criteria for
infectious disease is that it is caused by a pathogen
Communicable diseases are infectious diseases that spread rapidly and easily (AKA infectivity)
Contagious: extra communicable
3 parts of EPI triad? - Answer Host
Agent
Environment
3 most common agents? - Answer Bacteria
Viruses
Fungi
6 characteristics of an agent? - Answer Infectivity
Pathogenicity
Virulence
Immunogenicity
Antigenic stability
Survival
Vectors vs non-vectors? - Answer Vectors are organisms that carry a parasite/pathogen from
host to host - asymptomatic carriers
Mosquitos carrying malaria from person to person (Mosquito = Vector)
, Non-vectors are humans, birds, bats and other vertebrates
Environment characteristics that increase risk of disease? - Answer Physical, biological, social
economic:
Weather
Housing
Geography
Occupational setting
Air/water quality
Food
What are the five sites of infection? (On your body) - Answer Eyes
Digestive Tract
Mouth + nose
Skin
Genitals + urinary tract
5 examples of direct route of transmission? - Answer Skin to skin
Sneeze/cough
Breast milk
Mucous-mucous
Across placenta
4 examples of indirect route of transmission? - Answer Food borne
Water borne
Vector borne
Airborne (cold germs living on a door knob)
What is an agent? - Answer a factor that causes or contributes to a health problem or
condition
What is a host? - Answer person or animal susceptible to the pathogen
Natural reservoir
6 characteristics that increase risk for host? - Answer Age
