Unit 9 Lesson 3 Epidemics Explained课件-2023-2024学年高中英语北师大版（2019）选择性必修第三册

What kinds of epidemics do you know? ∙ SARS (非典) ∙ swine flu (猪流感) ∙ avian/bird flu (禽流感) ∙ EVD (埃博拉病毒) … What do you know about epidemics? Tick (√) the statements that you think are correct. An epidemic is the rapid spread of an infectious disease. An epidemic can affect a large number of people in a given population. An epidemic can occur within a short period of time, usually two weeks or less. An epidemic may spread to several countries or continents. Some common viruses, such as the common cold, are not epidemics. A new epidemic can be a different variation of a virus that people caught in the past. P58 1 Now, let's read a passage to learn more about epidemics. Read the passage and answer the questions. Task 1 ∙ What is an epidemic? ∙ How can a disease be classified as an epidemic? ∙ Circle all the epidemics mentioned in the passage. P58 2 Check your answers. ∙ What is an epidemic? ∙ How can a disease be classified as an epidemic? ∙ Circle all the epidemics mentioned in the passage. bird flu 1918 Spanish Flu The Black Death SARS Ebola Virus Disease (EVD) Bird Flu Name Period Places Death toll Bird Flu since 1997 more than a hundred lives Many people fear it could be the next global epidemic, especially (as scientists who have gone into detail studying tissue samples from the bodies of people (who died of the 1918 Spanish Flu) have proved (that bird flu is a modern adaptation of that virus)). Epidemics in the Roman Empire the Black Death EVD Spanish Flu SARS Task 2 Read the passage again. Complete the table about the epidemics mentioned. Why did bird flu have such a low baseline? Name Period Places Death toll Epidemics in the Roman Empire 500-550 CE Rome half the population it was one of the main causes of the fall of the Roman Empire. Bird Flu the Black Death SARS EVD Epidemics in the Roman Empire Spanish Flu What is the influence of Epidemics in the Roman Empire ? Name Period Places Death toll The Black Death 1330s Asia and Europe because one visible symptom