首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
医学
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that
admin
2018-05-06
57
问题
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that have undergone no significant genetic change. In analyzing the latter, scientists have discovered the importance of social and ecological factors to epidemics. Poliomyelitis, for example, emerged as an epidemic in the United States in the twentieth century, by then, modern sanitation was able to delay exposure to polio until adolescence or adulthood, at which time polio infection produced paralysis. Previously, infection had occurred during infancy, when it typically provided lifelong immunity without paralysis. Thus, the hygiene that helped prevent typhoid epidemics indirectly fostered a paralytic polio epidemic. Another example is Lyme disease, which is caused by bacteria that are transmitted by deer ticks. It occurred only sporadically during the late nineteenth century, but has recently become prevalent in parts of the United States, largely due to an increase in the deer population that occurred simultaneously with the growth of the suburbs and increased outdoor recreational activities in the deer’s habitat. Similarly, an outbreak of dengue hemorrhagic fever became an epidemic in Asia in the 1950s because of ecological changes that caused Aedesaegypti, the mosquito that transmits the dengue virus, to proliferate. The stage is now set in the United States for a dengue epidemic because of the inadvertent introduction and wide dissemination of another mosquito, Aedesalbopictus.
It can be inferred from the passage that Lyme disease has become prevalent in parts of the United States because of______.
选项
A、the inadvertent introduction of Lyme disease bacteria to the United States
B、the inability of modern sanitation methods to eradicate Lyme disease bacteria
C、a genetic mutation in Lyme disease bacteria that makes them more virulent
D、an increase in the number of humans who encounter deer ticks
答案
D
解析
细节题。题目问的是根据文章内容,莱姆病在美国部分地区流行的原因是______。根据Lyme disease定位到文中第六、七句“Lyme disease,which is caused by bacteria that are transmitted by deer ticks...recently become prevalent in parts of the United States,largely due to an increase in the deer population...and increased outdoor recreational activities in the deer’s habitat”可知,莱姆病在美国部分地区流行是由于鹿蜱传播了导致莱姆病的病菌,而越来越多的人又接触到鹿蜱,故选D。
转载请注明原文地址:https://kaotiyun.com/show/peT3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
A.细胞中含粗大嗜天青颗粒比例≥30%B.POX反应、非特异性酯酶均阴性C.糖原染色阳性,呈块状或颗粒状D.过氧化物酶阳性E.非特异性酯酶阳性,能被NaF抑制属于急性单核细胞白血病的表现是
High-speedlivinghasbecomeafactoflife,andthefranticpaceistakingitstoll,accordingtosciencewriterJamesGleick.
Physicsandchemistryhavefurnishedthetechniquesforbiologiststotaketheexplorationoflifetoitslogicalconclusion.Th
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
Youcannotburdenyourmemorywithtoomuchinformation.
Thepopularideathatclassicalmusiccanimproveyourmathsisfallingfromfavor.Newexperimentshavefailedtosupportthew
Inasocietywhereallaspectsofourlivesaredictatedbyscientificadvancesintechnology,scienceistheessenceofourexi
WhenitissunnyinJune,myfathergetsinhisfirstcuttingofhay.Hestartsonthecreekmeadows,whichareflat,sandyand
A、Thrilled.B、Refreshed.C、Exhausted.D、Depressed.C根据文中we’veactedforhours,Let’sgetsomethingtoeat,We’dbeabletofeelbe
Generally,vaccinemakers______thevirusinfertilizedchickeneggsinaprocessthatcantakefourtosixmonths.
随机试题
如果脉冲重复频率是10kHz,下面哪种多普勒频移可导致混叠
某企业“应付账款”科目月末贷方余额20000元,其中:“应付账款——甲公司”明细科目贷方余额为15000元,“应付账款——乙公司”明细科目贷方余额为5000元。“预付账款”科目月末贷方余额30000元,其中:“预付账款——A单位”明细科目借方余额为
对危害健康行为下列哪个概念是错误的
抗感冒药的组方原则A、咖啡因B、抗过敏药C、菠萝蛋白酶D、解热镇痛药E、鼻黏膜血管收缩药促进药物对病灶的渗透和扩散
关于国家的领土主权,下列说法中正确的有:
品牌战略的类型包括单一品牌战略、多品牌战略和()。
(2016年)下列有关关联方审计的说法中错误的有()。
某学生学习钢琴弹奏技能,在练习一段时间之后发现自己的成绩总是提高不明显.其原因可能是由()现象导致的。
IS—LM曲线IS的左下方、LM的右下方区域的均衡,是()。
Check-inRequirementsPassengersandtheirbaggagemustbecheckedinatleast45minutesbeforedeparturefordomesticflig
最新回复
(
0
)