Effectiveness of hand washing

1. Food , Hands and Bacteria
Yousef Elshrek

2. Bacterial Growing Media

3. • Experiment (1)
Place the unwashed fingers on the bacterial
growth media
Place the unwashed fingers on the bacterial
growth media

4. Bacteria growth after 24 hours incubated
at 37 C due to contamination unwashed
hands

5. • Bacterial growth after 24 hours due to
contamination rinsed hands
• Washed hands with water only for 20 Seconds

6. • Bacterial growth after 24 hours due to
contamination washed hands
• Washed hands 20 sec using soap and water

7. • Bacteria growth after 24 hours due to
contamination washed hands
• Washed hands 40 sec using soap and water

8. • Bacterial growth after 24 hours due to
contamination washed hands
• Washed hands 20 sec using soap and water
sanitized

9. Bacterial growth from one sneezing drops

10. Unwashed gloves

11. Washed gloves with water only for 20 second

12. Washed gloves 20 sec using soap and water

13. Washed gloves 40 sec using water and soap

14. Washed gloves 20 seconds using
water , soap and sanitizer

15. Bacterial growth on head hair after 24 hrs

16. Bacteria growth on kitchen
apron after 24 hours

17. • The growth of bacteria from the cockroach
after 24 hours

18. • Washing hands with solid and liquid soaps
• Soaps are not designed to kill microbes.
• The help to wash them of skin, better than
water alone.
• The solid soap had more bacteria living on it
than the liquid soap, which had none

19. • Cutting boards
• Cutting boards are another source of bacteria
and should be washed thoroughly after each
use.

20. • Missed washing hands areas
• Fluorescent dye is applied to the hands before washing.
Following washing, the hands are examined under UV
light for any traces of dye. Compare your handwashing
with the diagram that shows commonly missed area