Exam 5: Control of Microbial Growth

Jasmine's boyfriend Paul has a large boil on his back. The boil is very painful to touch, and is surrounded by an area of redness that is warm to the touch. Jasmine tells you that she and Paul have decided that Jasmine will "pop" the boil later that evening when they are both home from school. You ask Jasmine what she plans to use to open the boil and she tells you she has a knife with a sharp point that she will use, and that she will wash it well with dishwashing detergent before she uses it. -At the end of your conversation with Jasmine, you tell her that the best course of action for her and Paul is to go to the clinic and have the boil treated there. A boil is a serious infection and the risks of trying to treat it at home are just too great.

Boiling is not reliable for sterilization because

Which are essentially equivalent treatments?

Which of the following are resistant to destruction by typical disinfection methods?

Glutaraldehyde

Ethylene oxide is gas that

The endospores of Pseudomonas make that organism very difficult to kill.

Gamma rays cause biological damage in living systems by

Prions are easily destroyed by common sterilization procedures.

A common environmental organism that may even grow in certain chemical disinfectants is

You go hiking with some friends in a nearby national park. The weather is cool when you set out but it quickly becomes very warm. Neither you nor your friends are carrying enough water. Eventually you find a stream and because you are so thirsty, you drink from it. About a week later you start to feel unwell. You have vomiting, abdominal cramps, and explosive diarrhea (loud, severe diarrhea). Your stool seems kind of oily and is difficult to flush away. You tell your RN brother about your signs and symptoms, and he tells you he thinks you may have giardiasis, caused by the protozoan Giardia lamblia. -Your brother tells you that most likely you ingested Giardia cysts that were in the stream water. He says you should have treated the water before you drank it. Which of the following would NOT have been a possible way for you to do this, as a hiker? 

Compounds of tin, mercury, arsenic, and copper are no longer used to prevent microbial growth in cooling water primarily because

Jasmine's boyfriend Paul has a large boil on his back. The boil is very painful to touch, and is surrounded by an area of redness that is warm to the touch. Jasmine tells you that she and Paul have decided that Jasmine will "pop" the boil later that evening when they are both home from school. You ask Jasmine what she plans to use to open the boil and she tells you she has a knife with a sharp point that she will use, and that she will wash it well with dishwashing detergent before she uses it. -Jasmine tells you she plans to wash her hands with soap and water before working on Paul's boil, to get rid of all the bacteria on her skin and prevent the possibility of Paul getting an infection. You tell her

One of the first chemicals used by Lister to prevent surgical infections was

To reduce or eliminate disease-/spoilage-causing organisms, food is often subjected to

Phenolics

Alcohols are not reliably effective at destroying

Ultraviolet radiation at the bactericidal wavelength destroys bacteria by

Upon treatment with heat or chemicals, bacteria will

Which is True of nosocomial infections?