Hand Washing Techniques Questions

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Otero Junior College *

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Biology

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May 26, 2024

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1 Hand Washing Techniques Answer Sheet Pre-Laboratory Questions 1. After handling raw chicken would it be safe to just rinse your hands under running tap water before finishing the meal preparation? No, just rinsing your hands will not wash off the contaminates of the raw chicken. Raw chicken can carry E.coli and salmonella and by not washing your hands with soap and water you risk contaminating other surfaces or foods. Any time you are handling raw chicken or meat you must wash your hands before preparing any other part of the meal or touching anything else. 2. If you answer your phone when you are handling raw chicken, will the phone get contaminated? If you are handling raw chicken and don’t wash your hands before answering your phone then Yes your phone will get contaminated. Your hands are still contaminated from the raw chicken and any microbes that are on it. By not washing your hands beforehand, you risk contaminating your phone with these microbes when you answer it. 3. Which direction should you have the water flow over your hands? The direction of the water flow over your hand should be downward. When washing your hands and rinsing your fingers should be directed downward to wash all the bacteria from the upper part of you hands/wrist/arms down into the sink. 4. Can a shared cloth hand towel spread germs to others in a household? Yes a shared cloth hand towel can spread germs to others in a household. If one person doesn’t wash their hands thoroughly or just rinses their hands off without washing with soap and water and then dries them, the contaminates on that person’s hands will transfer onto to hand towel. When the next person dries their hands, even if they washed their hands thoroughly, they have the potential to pick up the microbes that were left on the hand towel. That is why it is important to dry your hands with a disposable paper towel each time. 5. What is the reason for transferring tap water from the beaker to the test tubes in this investigation? The reason for transferring tap water from the beaker to the test tubes is to mimic contamination and to show how easy it is for an area in your workspace to get contaminated. ©2015 Carolina Biological Supply Company

2 Observations Fill out the table below according to the instruction listed in the lab manual Data Table 1 Section Number of “contaminated” spots counted No wash 20 Quick wash 12 Good wash 5 Post-lab Questions 1. What was the main difference you saw between your routine hand washing technique and the Good wash from the manual? The difference between by routine hand washing technique and the Good wash from the manual is my routine wash isn’t as thorough as the good wash from the manual. When I was my hand I typically do not scrub between fingers, scrub my knuckle or clean beneath my fingernails. After completing this lab however, I will definitely be washing my hands more thoroughly to include between my fingers and fingernails to make sure they are washed properly. 2. Which part of your hands did you find the most difficult to clean? I found cleaning the nails and underneath the nails the most difficult to clean. They say the nails are one of the dirtiest parts of the body and I can see why now. 3. When examining your lab coat or lab apron after the Quick wash, you probably saw little spots of “contamination”. How can you explain that? When your hands are contaminated you unknowingly touch parts of yourself without realizing. I think some part of my contaminated hands may have touched the apron without me knowing. ©2015 Carolina Biological Supply Company

3 Also when you are washing your hands it’s possible that the contaminates may have splashed on the apron which would have contaminated it. 4. When would you suggest washing your hands during an experiment: only at the end, only at the beginning, or maybe more frequently? When you are performing an experiment, it is important to wash your hands frequently to avoid contamination of your work space. You should definitely wash before and after and experiment but you inadvertently touch something that is contaminated you should immediately wash your hands before proceeding to the next step of the experiment. 5. Which drying method might work best for minimizing the spread of microbial contamination to others: A cloth towel, a paper towel, or an air dryer? Explain your answer. I think a paper towel is the best method for drying your hands to minimize the spread of microbial contamination. A paper towel is disposable and only used once so it decreases the risk of spreading microbes to others. If you use a cloth towel and don’t properly wash your hands then dry them with that towel, left over microbes can be left on that towel and then transfer on to the next person who uses it to dry their hands. When drying hand with an air dryer, again if hand aren’t washed properly then left over microbes can fly off your hands into the air and onto surfaces contaminating them. 6. What would be the best way to turn on a faucet when you have contaminated hands? When your hands are contaminated the best way to turn on a facet is to use a paper towel to turn it on. Using a paper towel decreases the risk of contaminating the facet with your hands. ©2015 Carolina Biological Supply Company

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