Scientists conducted several experiments to study bacterial growth from unwashed hands and surfaces. They found that placing unwashed fingers on growth media led to significant bacteria after 24 hours. Washing hands with just water for 20 seconds reduced bacteria but did not eliminate it. Washing hands with soap and water for 20 seconds was more effective at removing bacteria. The most effective method was washing hands with soap and water for 20 seconds followed by using a sanitizer, which resulted in very little bacterial growth after 24 hours. Similar results were found for washing gloves, aprons, and eliminating bacteria tracked in from cockroaches. Proper handwashing and sanitization is effective at removing bacteria from hands and surfaces.

1. Food , Hands and Bacteria

2. Bacterial Growing Media

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

4. Place the unwashed fingers on the
bacterial growth media

5. • RESULTS AFTER 24 HOURS
• Bacteria growth after 24 hours
due to contamination unwashed
hands

6. Bacterial Growth after 24 Hours

7. • RESULTS AFTER 24 HOURS
• Bacterial growth after 24 hours due to
contamination rinsed hands
• Washed hands with water only for 20
Seconds

8. washed hands with water only for 20
Seconds

9. • RESULTS AFTER 24 HOURS
• Bacterial growth after 24 hours due to
contamination washed hands
• Washed hands 20 sec using soap and water

10. Hand washed with water and soap
for 20 Seconds

11. • RESULTS AFTER 24 HOURS
• Bactera growth after 24 hours due to
contamination washed hands
• Washed hands 40 sec using soap and water

12. Hand washed with water and soap for 2o
Seconds

13. • RESULTS AFTER 24 HOURS
• Bacterial growth after 24 hours due to
contamination washed hands
• Washed hands 20 sec using soap and water
And sanitized

14. Washed hands 20 sec using soap and
water And then sanitized

16. Bacterial growth from one sneezing drops

17. Unwashed gloves

18. washed gloves with water only for 20
second

19. washed gloves 20 sec using soap and water

20. washed gloves 40 sec using water and
soap

21. washed gloves 20 seconds uasing
water , soap and sanitizer

22. Bacterial growth on head hair after 24 hrs

23. bacteria growth on kitchen
apron after 24 hours

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

25. Some forms of bacteria on hands and
kitchen clothes