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Inquiry Science 9
March 2, 2012
Polio victim
in Iron Lung
ET # 53: a) What is the difference between a
disease causing agent and a disease vector?
b) List all of the ways infectious diseases are
transmitted.
1. Work on Infectious Diseases
Project - Presenting next class
Homework: Prepare for Presentation
Ring worm
SCR #53:
Cholera patients
MRSA
Mosquito – Malaria, West
Nile Virus
Mouse – Hanta Virus
Tick – Lyme Disease
ET # 53: What is the difference between a disease
causing agent and a disease vector?
A disease causing agent is the thing that actually
gets inside and causes the disease:
Examples:
• Viruses
• Bacteria
• Nematodes (worm-like, ex. hookworms, tape
worms, heart worms)
• Protists (various single-celled protozoans)
A disease vector is the living thing that
spreads or transmits the disease (but
doesn’t cause the disease:
Examples:
• Mosquitoes
• Rats/mice
• Ticks
• Birds
• Humans!
ET # 53: List all of the ways infectious diseases are
transmitted.
• droplet contact - coughing or sneezing on
another person
• direct physical contact - touching an infected
person, including sexual contact
• indirect contact - touching a contaminated
surface (ex. door knob, faucet)
• airborne transmission - if the microorganism
can remain in the air for long periods
• fecal-oral transmission - from contaminated
food or water sources
• vector borne transmission - carried by insects
or other animals
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