E. coli: The Good, The Bad, And The Ugly

1. E. coli: The Good, The Bad, And The Ugly

2. Introduction How many ofyou like to go swimming in Lake Shafer? How many of you live in the “watershed area”?

3. Hoagland Ditch Watershed Honey Creek Watershed What is a watershed? It is the area drained by a water system.

4. N WATERSHED

5. N

6. E. coli & Lake Shafer Lake Shafer is known to contain high levels of E. coli periodically during the year. Sources of water and E. coli draining into Lake Shafer comes from the watershed area. 81% of ditches, rivers, and lakes do not support full body contact recreation in Indiana (IDEM)

7. 0.001 mm What is Escherichia Coli? E. coli was discovered by Dr. Theodor Escherich, who discovered this bacterium in 1885. It belongs to the Family Enterobacteriaceae. These organisms happily inhabit the intestinal tract of most warm blooded animals. 10 μm

8. Escherichia coli (E. coli) Can be used to indicate the possible presence of bacteria that may be harmful to human health. Other indicators of water quality test for things like sediment and fertilizers. 0.001 mm BASIC RULE: If the water looks dirty, it probably is!!!

9. What Good Are E. coli? • Protects the intestinal tract from bacterial infections • Aids in digestion • Produces our main source of vitamins B12 and K 4) Lives symbiotically with us (we help them to live, and they help us to live)

10. Bad E. coli While most E. coli are good for you, there are a few strains of E. coli that are harmful to humans. ~ 5 billion bacteria in your intestines alone It is possible to get an individual strain of E. coli that is harmful to you.

11. Local, National, & International Concern According to USDA, E. coli O157:H7 causes ~ 73,000 cases of infection and 61 deaths in the USA each year. Many countries around the world are constantly suffering from E. coli contamination. Common cause of diarrhea in tourists

12. Case Study: New York 1999 Attendees of a county fair became ill from E. coli poisoning Source: Runoff from a barn that housed cattle contaminated the water supply at the fair At least 155 people became ill

13. What does this have to do with us? Lake Shafer contains high amounts of E. coli during different times of the year. Chances of getting sick from E. coli are very small But we want to make them even smaller! Currently, research is being done to try and solve the problem.

14. E. coli in Lake Shafer E. coli concentrations up to 20,000 colony-forming units (cfu) per 100mL Indiana water-quality standard for full-body contact is 235 cfu/100mL Less money is made at Indiana Beach People blame one another for the problem More information needed to find cheap solutions that will work

15. Any idea, based on scientific fact, to explain something. Hypothesis: An idea to account for certain facts, and it may be tested to see whether or not it is correct The Scientific Method Theory:

16. Where’s It All Coming From? 1) Know what possible sources are: Farm Animals Fertilizers Sewage Treatment Plants Residential Areas (septic tanks) 2) Some of these sources get into the water system

17. Method: A procedure or way of doing something Results: Interpretation of the data produced by the method used to test the hypothesis Conclusion: Summarizes briefly the hypothesis and the results to produce an ending to your experiment The Scientific Method

18. Upstream: The direction from which the stream flows Downstream: The direction to which the stream flows Definitions Upstream Downstream Flow

19. flow Sampling Strategy (Methods)

20. Cattle in the Ditch

21. Residential Areas:Bays of Lake Shafer

22. Wastewater Treatment Plant

23. Place water sample on medium in petri dish. Wait 24 – 48 hours to allow E. coli to grow Count colonies of E. coli in the petri dish Each dot represents an entire colony of E. coli, not an individual E. coli cell Collecting & Analyzing Data

24. Results & Conclusions E. coli count units = cfu/100ml

25. Results & Conclusions E. coli count units = cfu/100ml

26. Results & Conclusions