Initiation of infection by Mycoplasma pneumoniae begins with
A. Elaboration of a polysaccharide capsule that inhibits phagocytosis
B. Secretion of a potent exotoxin
C. Adherence to respiratory epithelial cells mediated by P1 adhesin
D. Endocytosis by ciliated respiratory epithelial cells
E. Phagocytic uptake by alveolar macrophages
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The following statements about trachoma are correct except
A. Trachoma is readily prevented by a chlamydial vaccine
B. It follows chronic or recurrent eye infection with Chlamydia trachomatis.
C. Millions of people worldwide have trachoma.
D. Progression of trachoma can be slowed by intermittent treatment with azithromycin
E. Trachoma involves scarring of the conjunctiva, eyelid deformities, and eyelash injury to the cornea.
A 28-year-old woman who is 10 weeks pregnant presents to the obstetrics clinic for prenatal care. She has a history of treatment for syphilis 7 years previously. The results of serologic tests for syphilis are as follows: nontreponemal test, RPR, nonreactive; treponemal test (TP-PA), reactive. Which of the following statements is most correct?
A. The baby is at high risk for congenital syphilis
B. The mother’s previous treatment for syphilis was effective.
C. The mother needs to be treated again for syphilis
D. The mother needs a lumbar puncture and a VDRL test of her CSF for neurosyphilis
The soil is the natural habitat for certain microorganisms of medical importance. Which one of the following is LEAST likely to reside there?
A. Clostridium tetani
B. Chlamydia trachomatis
C. Mycobacterium intracellulare
D. Bacillus anthracis
《工程建设项目招标范围和规模标准规定》中关系社会公共利益、公众安全的基础设施项目包括( )等。
A. 防洪、灌溉、排涝、引(洪)水、滩涂治理、水土保持、水利枢纽等水利项目
B. 道路、桥梁、地铁和轻轨交通、污水排放及处理、垃圾处理、地下管道、公共停车场等城市设施项目
C. 用于食品加工的饮食基地建设项目
D. 生态环境保护项目
E. 邮政、电信枢纽、通信、信息网络等邮电通信项目
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