,
,
, D. Pasteur2and2Snow
Ans:2C
9. Semmelweis2showed2that2the2transmission2of2disease2could2be2interrupted2by:
A. killing2disease-carrying2mosquitoes.
B. disinfecting2water2supplies.
C. pasteurizing2milk.
D. washing2hands2in2chlorine2water.
Ans:2 D
10. In21854,2John2Snow2determined2that2contaminated2water2transmits:
A. smallpox.
B. cholera.
C. influenza.
D. anthrax.
Ans:2B
11. John2Snow2traced2the2source2of2an218542outbreak2of2cholera2to:
A. consumption2of2contaminated2beef.
B. an2increase2in2infected2mosquitoes.