1. What are the benefits of cleaning something to a level of cleanliness beyond what is required? What are some possible disadvantages of doing so?

2. In 2001, endospores of Bacillus anthracis, the causative agent of anthrax, were sent to government officials and news agencies via the mail. In response, the US Postal Service began to irradiate mail with UV light. Was this an effective strategy? Why or why not?

3. Why is the use of skin disinfecting compounds required for surgical scrubbing and not for everyday handwashing?



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