Determination of Ct values for chlorine of resistant enteroviruses

• Published in: Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2009-03, Vol.44 (4), p.336-339
• Main Authors: Black, Shamarie, Thurston, Jeanette A., Gerba, Charles P.
• Format: Article
• Language: English
• Subjects: Applied sciences; Chlorine; Chlorine - pharmacology; coxsackievirus; coxsackievirus B5; disinfection; drinking water; Drinking water and swimming-pool water. Desalination; Drug Resistance, Viral; Echovirus; Enterovirus - drug effects; Exact sciences and technology; Guidelines as Topic; poliovirus; Pollution; United States; United States Environmental Protection Agency; Water Microbiology; Water Supply - standards; Water treatment and pollution
• ISSN: 1093-4529; 1532-4117
• DOI: 10.1080/10934520802659653

Information on the required chlorine dose or Ct value (concentration of free chlorine multiplied by contact time) is limited to only a few enteroviruses. In this study the Ct values of some of the reported more chlorine resistant enteroviruses were determined. The Efficiency Hom Model was used to predict the times for 2, 3. and 4 -log inactivation of echovirus 1 and 12, coxsackievirus B5 and poliovirus type 1 at pH 7.5 and 9 at 5°C. Coxsackievirus B5 was the most resistant to chlorine with a Ct requirement of 11.5 mg× min/L at pH 7.5 at 5°C compared to polio with a Ct of 5.3 mg× min/L under the same conditions. All the viruses were more resistant than polio 1 at pH 9.0.