1、Unit 9 Human BiologyLesson 3 Epidemics ExplainedWarming-up 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 co
2、untries 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.What do you know about epidemics?Tick the statements that you think are correct.ReadingRead the passage quickly and answer the que
3、stions.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
4、once a certain number of deaths have occurred from the disease.ReadingRead the passage again and find all the epidemics mentioned in the passage.Epidemicsbird flu line 191918 Spanish Flu line 26Black Death line 33SARS line 43Ebola Virus Disease line 53ReadingSARS(Severe Acute Respiratory Syndrome)严重
5、急性呼吸道综合症，惯称“非典型肺炎”，简称“非典”，是可致命的传染病。Ebola Virus Disease(EVD)埃博拉病毒性疾病，是一种死亡率高的急性出血性传染病。ReadingNamePeriodPlacesDeath tollBird FluEpidemics in the Roman EmpireThe Black DeathThe Spanish FluSARSEVDRead the passage carefully.Complete the table about the epidemics mentioned.Then choose one disease to talk
6、about with a partner.since 1997more than a hundred lives500 550 CERomehalf the population1330sAsia and Europe1918 the end of World War I50 million people2002 2003China,Canada,Vietnam and Singapore2013-2016West Africamore than 11310 deathDeveloping Concepts Based on the TextConcepts are not always cl
7、early defined in a text.You need to read and develop your understanding.Read the text to get the general idea.Identify all the information related to the concept,e.g.examples,developments,effects,etc.Organise the information and explain the concept from different angles.Post-readingRead and understa
8、nd the content in the Skill Builder.Post-reading when epidemics started examples of epidemics treatments baseline number of deaths of epidemics definition when it ended possible causes of epidemics possible solutionsTick the aspects of information that are mentioned in the passage.Post-readingUse a
9、diagram to demonstrate in a logical way how the aspects of information are organised.EpidemicsPost-reading1What are the main features of an epidemic?Give at least two examples to illustrate your points.2What should different countries do to prevent outbreak of epidemics in the future?Why?3What does
10、the title mean to you?What does the writer want to convey in the passage?4Who do you think the passage is written for?Work in groups and discuss the questions.Post-reading1What are the main features of an epidemic?Give at least two examples to illustrate your points.Post-readingThey should work toge
11、ther because teamwork among nations across the globe can save lives.This is a good example of building a community with shared future for mankind.2 What should different countries do to prevent outbreak of epidemics in the future?Why?Post-reading The title means that the passage will explain questio
12、ns about epidemics.3 What does the title mean to you?What does the writer want to convey in the passage?The author wants to convey the information that we are always on our way to find an explanation to epidemics so as to find cure.It also implies that epidemics occurred naturally and inevitably(不可避
13、免地).We can only explain it,and cannot prevent it or stop it completely now.Post-reading4Who do you think the passage is written for?This is a popular science article.It is more likely to be written for people who is interested in this topic or who has a lot of questions or misunderstanding of epidem
14、ics.Post-reading1Epidemics can be caused by 2Diseases can only be officially classified as epidemics when 3The Spanish Flu spread worldwide because 4Since the end of the SARS epidemic,scientists 5Countries need to work together to conduct thorough and systematic research because Complete these sente
15、nces in your own words.Post-reading1Epidemics can be caused by a virus being carried into an area,or changes in the way people live.2Diseases can only be officially classified as epidemics when a baseline number of people have died from the disease.3The Spanish Flu spread worldwide because soldiers
16、and other people were moving and travelling around the world after World War I.4Since the end of the SARS epidemic,scientists have been doing experiments on treatments to prevent further outbreaks.5Countries need to work together to conduct thorough and systematic research because teamwork among nations across the globe can save lives.AssignmentSearch online in groups and find some information about epidemics in China or Asia.Report your information to the class.Goodbye!
