How does the body protect us from pathogens?

Identify the three lines of defence against pathogens.

What is immunity and how does it develop in a population?

1. Give the function of the immune system.

In each of the following scenarios, indicate which of the human body's lines of defence (first, second, or third) would be responsible for defending it against pathogens. 1. A student touches a doorknob that has some viruses on it. Which line of defence will try to protect the student from the viruses on her hand?

What two key factors distinguish an epidemic from an outbreak and a pandemic?

For each case described below, indicate whether it is an example of an epidemic, an outbreak, or a pandemic. a) In 1994, over 23,000 deaths occurred in refugee camps in the Congo due to cholera.

For each case described below, indicate whether it is an example of an epidemic, an outbreak, or a pandemic. b) In 2003, SARS killed over 800 people worldwide.

For each case described below, indicate whether it is an example of an epidemic, an outbreak, or a pandemic. c) In 2014, cholera spread rapidly to over 42 countries with 190,549 reported cases and 2,231 deaths.

In each of the following scenarios, identify whether it has a social impact, an economic impact, or both on human populations. a) Thousands of deaths were reported during the H1N1 pandemic.

In each of the following scenarios, identify whether it has a social impact, an economic impact, or both on human populations. b) There was a decline in tourism due to the spread of the Zika virus.