Cyanobacteria chất độc trong nước uống một rủi ro Y tế? Chúng tôi là tất cả tự nhiên có liên quan về sức khỏe của chúng ta và sức khỏe của những người khác xung quanh chúng ta. Tuy nhiên, tập trung chủ yếu các mối quan tâm của chúng tôi sẽ được khác nhau tùy thuộc vào việc chúng ta đang sống trong một quốc gia phát triển hoặc trong một phần kém phát triển của thế giới. Trong quá khứ tương đối gần đây, các bệnh truyền nhiễm đường tiêu hóa đã được nguyên nhân chính gây tử vong. | 8 Risk and Safety of Drinking Water Are Cyanobacterial Toxins in Drinking Water a Health Risk We are all naturally concerned about our own health and the health of others around us. The main focus of our concerns will however be different depending on whether we live in a developed nation or in a less developed part of the world. In the relatively recent past communicable gastrointestinal diseases were major causes of infant mortality worldwide and were often transmitted through drinking water. This disease source has been combated with success by the construction of sewage systems and the provision of clean disinfected drinking water supplies. Epidemics of the more lethal gastrointestinal diseases such as cholera still occur in rural populations with no clean drinking water and in towns where drinking water disinfection has failed. An example of failure of effective disinfection of a town drinking water supply leading to severe illness and deaths in the population is the recent dramatic instance at Walkerton Ontario Canada. Enteric disease organisms coming from a farm were washed into a shallow well by heavy rain and distributed in the town drinking water. Illness occurred in 2300 people out of a population of 4800 and 7 deaths resulted. Other severely affected patients had lasting organ damage O Connor 2002 Hrudey Payment et al. 2003 . A primary responsibility of the drinking water supply industry is therefore to prevent the transmission of disease through the drinking water and the regulations governing drinking water have a necessary focus on disease organisms. Of lesser importance are turbidity taste odor and chemical contaminants. As the availability of disinfected microbiologically safe drinking water has increased attention has focused on these other issues. Consumers are inevitably concerned about turbidity taste and odor which are immediately discernible and underlie most of the complaints that drinking water utilities receive. Changes in the apparent .
