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1、2019-2020年高中英语Unit21HumanBiologylesson3教学学案北师大版选修7EpidemicsthroughouthistoryWithrecentnewsreportsconnectedBirdFluwithakillerepidemicinthepast,JimSmithlooksthroughthehistoryofepidemicsforcluesaboutwhatthefuturemighthold.Bacteriaandviruseshavebeenaroundsincethebeginningoflifeo
2、nEarthandmanyoftoday’sdiseaseshaveexistedaslongashumanshave.Itisimportanttolookatthespreadofdiseasesthroughouthistorytodiscoverthecausesandeffectsofepidemics,andhopefully,foreseeandpreventtheminthefuture,especiallyasscientistsprovedthatBirdFluisamodernadaptationofthesameviru
3、softheSpanishFlu.Oneoftheearliestepidemicsonrecordhappenedabout500-550ADwhentheRomanemperoratthetimewasattemptingtorebuildtheRomanEmpire.Thisepidemic，whichwascalledJustinian’sPlague,sweptthroughNorthAfrica,theMiddleEastandEurope.Scientistsnowguessthatupto50%ofthearea’spopula
4、tiondiedfromthisepidemicmakingitoneofthemaincausesofthefalloftheRomanEmpire.Inthe1330’s,theepidemicreturned,thistimeinAsia.Thisspreadrapidlyandbecameknownas“TheBlackDeath”asonesymptomwasblackspotsonthebody.InurbanareasalloverEurope,Asia,AfricaandtheMiddleEast,uptoonehalfofth
5、epopulationwaslosttotheBlackDeath.AnotherepidemicthatspreadinsimilarconditionswastheSpanishFlu.Itstruckabout1918-1920andleftfamiliesmourningworldwide.Havingkilledupto50millionpeoplein18months,withatendencytostriketheyoungandfitratherthantheold.Morepeoplediedofthefluthandiedi
6、nthewar.Yet,somehow,itwasforgottenbyhistoryuntilveryrecentlywhenSARSbecameacauseforconcern.TheSARSepidemicbeganin2002withalungdiseaseinGuangdongProvinceandspreadquicklyafterDrLiuJianjun,thecarrier,cametoHongKongandpassedthevirustopeoplewhocarriedittoCanada,VietnamandSingapor
7、e.Overninemonths,8000caseswerereportedinover30countriesacrossfivedifferentcontinentsand774peopledied.AlthoughthesestatisticsaremuchlessimpressivethanthosefortheSpanishFlu,SARSwasstillveryalarmingforafewkeyreasons.Generally,SARSsymptomsincludeahighfever,bodyaches,andheadaches
8、. However,astheillnessprogresses,mostpatientseventuallydeveloppneumonia. Th
