The Hidden World of Microbes and Their Impact on Health

The video explains the role of microbes in ecosystems, medicine, and food production. It discusses infectious agents, their transmission, and the chain of infection. Various modes of transmission, including direct, indirect, airborne, vector-borne, and vehicle-borne, are covered. Prevention strategies like hygiene, vaccination, and isolation are highlighted. The Swiss cheese model is used to illustrate layered prevention strategies. An example of Salmonella demonstrates the chain of infection and prevention measures.

What role do some microbes play in ecosystems?

• They are harmful to all living organisms.

• They support the flow of oxygen and nutrients.

• They have no role in ecosystems.

• They only cause diseases.

What is the term used for the movement of an infectious agent to a new host?

• Infection

• Transmission

• Contamination

• Invasion

Which of the following is NOT a mode of direct transmission?

• Skin-to-skin contact

• Kissing

• Contact with contaminated soil

• Airborne particles

How does indirect airborne transmission occur?

• Via respiratory droplets that travel short distances

• Through direct contact with an infected person

• Through airborne particles that remain suspended

• By touching contaminated surfaces

What is an example of a vector in vector-borne transmission?

• A piece of food

• A mosquito

• A doorknob

• A water droplet

Which prevention strategy can make hosts less susceptible to infection?

• Vaccination

• Hand washing

• Surface cleaning

• Isolation

What is the purpose of the Swiss cheese model in infection prevention?

• To demonstrate the effectiveness of a single strategy

• To explain the role of microbes in ecosystems

• To show how diseases spread

• To illustrate the layering of prevention strategies

In the example of Salmonella, what is the portal of exit?

• The mouth of a human

• A mosquito bite

• The chicken's cloaca

• A contaminated surface

How can indirect transmission of Salmonella be prevented?

• By using the same cutting board for all foods

• By cooking foods at proper temperatures

• By not eating any meat products

• By avoiding all contact with animals

What is the final step in the chain of infection?

• Portal of exit

• Mode of transmission

• Reservoir

• Portal of entry