Morepeopledieoftuberculosis(结核病)thanofanyotherdiseasecausedby
asingleagent.Thishasprobablybeenthecaseinquiteawhile.Duringthe--71.
earlystagesoftheindustrialrevolution.Perhapsoneineveryseventh--72.
deathsinEurope'scrowdedcitieswerecausedbythedisease.From--73.
nowon,Though,westerneyes,missingtheglobalpicture,sawthetroublegoing--74.
intodecline.Withoccasionalbreaksforwar,theratesofdeathand
infectionintheEuropeandAmericadroppedsteadilythroughthe19thand--75.
20thcenturies.Inthe1950s,theintroductionofantibiotics(抗菌素)
strengthenedthetrendinrichcountries,andtheantibioticswereallowed
tobeimportedtopoorcountries.Medicalresearchersdeclaredvictoryand--76.
withdrew.Theyarewrong.Inthemid-1980sthefrequencyofinfectionsanddeaths--77.
startedtopickupagainaroundtheworld.Wheretuberculosisvanished,it--78.
cameback;inmanyplaceswhereithadneverbeenaway,itgrewbetter.The--79.
WorldHealthOrganizationestimatesthat1.7billionpeople(athirdofthe
earth'spopulation)sufferfromtuberculosis.Evenwhentheinfectionrate
wasfalling,populationgrowthkeptthenumberofclinicalcasesmoreor
lessconstantlyat8millionayear.Around3millionofthosepeople--80.
died,nearlyalloftheminpoorcountries.
78.tuberculosis∧vanished→had