Question

Boiled water may acquire new pathogens after a few hours. How is it possible?​

Answer 1

Answer:

WATERBORNE PATHOGENS

There are many disease causing organisms that consumers could be exposed to through ingestion and contact with contaminated drinking water. The more common pathogens that can be found in drinking water are as follows:

Protozoa: Protozoa are microorganisms that can live in animals, people and the environment. Many protozoa have life cycle stages that include cysts and oocysts. The cysts and oocysts are generally resistant to normal residual chlorine levels, but are more readily deactivated by ultraviolet (UV) disinfection. Most protozoa, including cyst and oocyst stages, will be removed by water filtration devices capable of removing 1 micron particles (i.e. microfiltration). In New York State, diseases caused by species of Giardia, Cryptosporidium, and amoebae must be reported to the NYSDOH.

Bacteria: Bacteria are usually killed by normal chlorine residual levels. Most bacteria will be removed by microfiltration ("<"1 micron) and most will be effectively deactivated by ultraviolet (UV) disinfection, although some species may require increased UV doses. Bacterial spores can be resistant to normal chlorine disinfectant levels and some are resistant to UV. Small bacteria and spores may pass through filters at the microfiltration level. Bacteria that can cause waterborne illness include Escherichia coli; and species of Salmonella, Vibrio, Shigella, and Camphylobacter.

Viruses: Viruses are rapidly inactivated by normal chlorine residual levels. But their small size, typically less than 0.01 microns, allows viruses to pass through 1 micron filters. In addition, some viruses are resistant to inactivation by exposure to UV light. Hence, ordinary water filtration and UV disinfection may not provide adequate viral treatment and viruses are usually controlled with chemical disinfection. Viruses that can cause waterborne illnesses include: Hepatitis A,Adenoviruses, Hepatitis E, Enteroviruses (including Polio-, Echo and Coxsackie viruses), Rotaviruses, and Caliciviruses.

Answer 2

Explanation:

Boiled water may acquire new pathogens after a few hours because after few Hours the water again becomes cold and it may consist of new pathogens.

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