Didyougetaflushotthisyear？Forthefirsttime，theCentersforDiseaseControlandPreventionintheUSisrecommendingthatallchildrenagedfrom6monthsto18yearsreceivethefluvaccine.Vaccinesbattlediseasescausedbybacter
Didyougetaflushotthisyear？Forthefirsttime，theCentersforDiseaseControlandPreventionintheUSisrecommendingthatallchildrenagedfrom6monthsto18yearsreceivethefluvaccine.
Vaccinesbattlediseasescausedbybacteriaandviruses.Aweakenedformofthegerm(病菌)isintroducedintothebody.Thebodymakesspecialsubstancescalledantibodies(抗体)tofightthegerms.Iftheactualgermsweretoattack，theantibodieswouldfight.Becausetherearemanykindsoffluviruses，scientistsmustcreateanewvaccineformula(处方)eachyear.Researchersmustmakeaprediction.
Itislikeforecastingtheweather.Sometimestheyarerighton，andsometimestheyareoff.Butevenwhenthevaccinedoesnotcloselymatchcirculatingflutypes，itcanmaketheillnesslessserious.
“Thefluvaccineisnotaseffectiveasthepolio(小儿麻痹症)vaccineorthemeaslesvaccine，”saysDr.WilliamSchaffnerofVanderbiltUniversitySchoolofMedicine.“It’snotagreatvaccine，butitisinfactquiteagoodvaccine.”
Butafluvaccinedoesn’tworkforeveryone.Therearecertainpeoplewhoshouldbecarefulabouttakingit，becausethevaccineisproducedineggs.Thosewhoareallergic(过敏的)toeggsshouldnottakeit.Ifyouhaveafever，youshouldwaituntilyourecover.
Somepeopleareafraidthattheymightgettheflufromtheflushot.Scientistssaythatitisnotpossible，becausethevirusesintheflushotareinactivated.Butsomeminorsideeffectssuchaslowgradefeverandbodyachecouldoccur.Iftheydo，theybeginsoonaftertheshotandusuallylastonlyonetotwodays.
Didyouknow？Smallpoxwasthefirstdiseasepeopletriedtopreventbyputtingavirusintoahealthyperson.In1796，EnglishscientistEdwardJennerplacedsomeinfectedmaterialunderaboy’sskin.
小题1:Theunderlinedword“vaccine”(inPara.1)refersto________.A．virususedforfightingagainstdiseaseB．antibodytofightthegermsC．formulatofightagainstdiseaseD．germtobeinjectedintothebody小题2:Bysaying“It’snotagreatvaccine，butitisinfactquiteagoodvaccine.”(inPara.4)，WilliamSchaffnermeansthefluvaccine________.A．isaseffectiveasthepolioan