Swab results - December

If you joined us for the biomedical practical session at our December 4 Open day, you can now see your results!

The images are numbered, so you should be able to locate yours easily. All of the images have been labelled with the hand sanitizer used  - either antibacterial soap or alcohol based sanitizer.

What we found

The experiment was to imprint 3 fingers onto the agar plate, wash our hands with either of the sanitizers, then imprint the same fingers onto the other side of the plate.

Both of these sanitizers claim to kill 99.9999% of bacteria – have a look and draw your own conclusions! Interestingly, the hand soap seems to work much better overall than the alcohol based gel.

Compare growth, before and after washing, on plates numbered  42, 43 and 45.

Overall, the alcohol gel didn’t do very well! Compare before and after washing on plates 35, 46, 48 and 49.

If you have any questions, please email David.Lee@bcu.ac.uk

And one final point to leave you with – the type of growth agar that we used will not be the correct environment for some bacteria to grow on – so the likelihood is that there will be many more bacteria on your swabs than we see! 

Agar Jelly 1

From left to right

  1. Alcohol hand sanitizer - L= Before / R = After
  2. Alcohol hand sanitizer - L= After / R = Before
  3. Alcohol hand sanitizer - L= After / R = Before
  4. Alcohol hand sanitizer - L= After / R = Before
  5. Alcohol hand sanitizer - L= After / R = Before
  6. Antibacterial soap - L= After / R = Before
Agar Jelly 2

From left to right

  1. Antibacterial soap - L= after / R = before
  2. Antibacterial soap - L= after / R = before
  3. Antibacterial soap - L= after / R = before
  4. Alcohol hand sanitizer - L= after / R = before
  5. Antibacterial soap - L= after / R = before
  6. Alcohol hand sanitizer - L= after / R = before
Agar Jelly 3

From left to right

  1. Antibacterial soap - L= before / R = after
  2. Alcohol hand sanitizer - L= after / R = before
  3. Alcohol hand sanitizer - L= after / R = before
  4. Antibacterial soap - L= after / R = before
  5. Alcohol hand sanitizer - L= after / R = before
  6. Alcohol hand sanitizer - L= after / R = before