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Microsoft word - bad bugs by jeff.rtf
Bad Bugs, Bad Bugs, What You Gonna Do?
In a past article, I mentioned that all public water systems are required to have a written Coliform Sampling Plan. The plan can help the water system operator decide which corrective actions to take should routine coliform samples test positive. It is important to keep in mind the critical rational behind that requirement. Routine total coliform samples are taken to help determine if more harmful (pathogenic) microbiological organisms may also be present. The harmful ‘bugs’ – if present, can cause illness or even death in certain circumstances. The number of total coliform samples to be collected on a monthly basis depends on the size (population) and type (surface water or groundwater) of the water system. The following information should help clarify more specifically the harmful organism addressed in this article – E. coli
One of hundreds of strains of the bacterium Escherichia coli, E. coli
O157:H7 is a rising cause of food borne and waterborne illnesses. Although most strains of E. coli
are harmless and live in the intestines of healthy humans and animals, this strain produces a powerful toxin and can cause severe illness. E. coli
O157:H7 was first recognized as a cause of illness during an outbreak in 1982 traced to contaminated hamburgers. Since then, most infections are believed to have come from eating undercooked ground beef. However, some have been waterborne. In 1999, people became sick after drinking contaminated water in Washington County, New York and swimming in contaminated water in Clark County, Washington.
is a type of fecal coliform bacteria commonly found in the intestines of animals and humans. E. coli
is short for Escherichia coli
. The presence of E. coli
in water is a strong indication of recent sewage or animal waste contamination. Sewage may contain many types of disease-causing organisms. Fecal coliforms are bacteria that are associated with human or animal wastes. They usually live in human or animal intestinal tracts, and their presence in drinking water is a strong indication of recent sewage or animal waste contamination.
comes from human and animal wastes. It can enter water sources during rainfalls and snow melts, then be washed into creeks, rivers, streams, lakes, or groundwater. When these waters are used as sources of drinking water and the water is not treated or inadequately treated, E. coli
may end up in drinking water. Although most strains of E. coli
are harmless and live in the intestines of healthy humans and animals, O157:H7 produces a powerful toxin and can cause severe illness. Infection often causes severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea. Frequently, no fever is present. It should be noted that these symptoms are common to a variety of diseases, and may be caused by sources other than contaminated drinking water.
“In some people, particularly children under 5 years of age and the elderly, the infection can also cause a complication called hemolytic uremic syndrome, in which the red blood cells are destroyed and the kidneys fail. About 2%-7% of infections lead to this complication. In the United States, hemolytic uremic syndrome is the principal cause of acute kidney failure in children, and most cases of hemolytic uremic syndrome are caused by E. coli
O157:H7. Hemolytic uremic syndrome is a life-threatening condition usually treated in an intensive care unit. Blood transfusions and kidney dialysis are often required. With intensive care, the death rate for hemolytic uremic syndrome is 3%-5%.” (ref: USEPA
Symptoms usually appear within 2 to 4 days, but can take up to 8 days. Most people recover without antibiotics or other specific treatment in 5-10 days. There is no evidence that antibiotics improve the course of the illness, and it is thought that treatment with some antibiotics may precipitate kidney complications. Antidiarrheal agents, such as loperamide (Imodium), should also be avoided. To avoid playing the ‘guessing game’, consult with a physician. Diagnosis is done with stool sampling. Since most laboratories that conduct stool sampling do not test for E. coli
O157:H7, it is important to request the method that will determine its presence –
especially if blood is associated with diarrhea. Children under the age of five, the elderly, and people whose health and immune system is weakened, are at a greater risk of severe illness.
This kind of ‘bug’ will surely have an unwelcome presence in your water system. Generally speaking, our
public water systems are free of E. coli
O157:H7, yet it can be present and go unnoticed under many different
circumstances. Prevention is commonly the most practical approach. However, due to the severity of the
potential health effects that can result when its presence is known, immediate actions will have to be
implemented. In the Coliform Sampling Plan, make sure that proper protocol has taken place during and after
repeat sampling. E. coli
O157:H7 is considered an acute risk to health and initiates the ‘Tier 1 Public
Notification’ process. It would be well advised to have an EPA Public Notification Handbook at your water
system. It provides both the necessary notification requirements, as well as useful written notification templates
with pertinent health effects language. These are bad
bugs – don’t give them the chance to ruin an otherwise good
day – for anyone!
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