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

新北师大版高中英语选择性必修三Unit9 Human Biology Lesson3 Epidemics Explained COVID-19 COVID-19 is a new strain of coronavirus that has not been previously identified in humans. The COVID-19 is the cause of an outbreak of respiratory illness first detected in Wuhan, Hubei province, China. Pre-reading SARS Severe acute respiratory syndrome (SARS) is a viral respiratory illness that was recognized as a global threat in March 2003, after first appearing in Southern China in November 2002. Ebola Virus Disease Ebola Virus Disease (EVD) is a deadly disease with occasional outbreaks that occur mostly on the African continent. EVD most commonly affects people and nonhuman primates. It is caused by an infection with a group of viruses within the genus Ebola virus. 1. Describe epidemics using your own words. 2. Look at the above pictures and talk about the common points of epidemics. Look and Discuss What do you know about epidemics? Tick (√) the statements that you think are correct. 1. An epidemic is the rapid spread of an infectious disease. ( ) 2. An epidemic can affect a large number of people in a given population. ( ) 3. An epidemic can occur within a short period of time, usually two weeks or less. ( ) 4. An epidemic may spread to several countries or continents. ( ) 5. Some common viruses, such as the common cold, are not epidemics. ( ) 6. A new epidemic can be a different variation of a virus that people caught in the past. ( ) Fast-reading Read the passage and answer the following questions… 1. What is an epidemic? 2. How can a disease be classified as an epidemic? An epidemic is the name given to an infectious disease that rapidly spreads to a large number of people within a short period of time—usually two weeks or less. Each disease can only officially be classified as an epidemic once a certain number of deaths have occurred from the disease. Fast-reading Bird Flu 1918 Spanish Flu Black Death SA