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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2008.tde-19092008-130053
Document
Author
Full name
Karina Medici Barrella
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Mehnert, Dolores Ursula (President)
Matte, Glavur Rogerio
Rivera, Irma Nelly Gutierrez
Sanchez, Petra Sanchez
Schneider, Rene Peter
Title in Portuguese
Pesquisa de vírus entéricos humanos em lodos de esgoto originários de duas ETEs do Estado de São Paulo: estabelecimento e avaliação de metodologia para recuperação e detecção viral.
Keywords in Portuguese
Adenovírus entéricos
Esgoto
Estação de tratamento de esgoto
Lodo de esgoto
Reação em cadeia da Polimerase (PCR)
Vírus da hepatite A
Abstract in Portuguese
O objetivo foi desenvolver e avaliar uma metodologia simplificada para detecção de vírus entéricos humanos em lodo de esgoto. O método foi baseado em eluição viral com solução protéica, seguida de ultracentrifugação. Alguns parâmetros foram avaliados (tempo e pH de eluição, condições de clarificação e purificação). A seguir, foi aplicado à pesquisa de adenovírus, vírus da hepatite A e norovírus em amostras colhidas ao longo de 12 meses em duas ETEs do estado de São Paulo. Amostras pareadas de esgoto foram também examinadas como referência da presença viral. A detecção viral por PCR, RT-PCR e PCR em tempo real, revelou a presença de adenovírus, incluindo os entéricos (espécie F) e vírus da hepatite A tanto nas esgoto como no lodo de ambas as ETEs. Norovírus não foram detectados. Vírus infecciosos não foram detectados no lodo submetido ao tratamento químico (ETE A). Parte dos vírus presentes na água de esgoto ficaram retidos no lodo e análises estatísticas revelaram que o tratamento químico adotado na ETE A é eficiente para a inativação viral.
Title in English
Detection of human enteric viruses in sewage sludge from two sewage treatment plants in São Paulo state: establishment and evaluation of a method for viral recovery and detection.
Keywords in English
Enteric adenoviruses
Hepatitis A virus
PCR
Sewage
Sewage sludge
Sewage treatment plant
Abstract in English
The aim was to develop and evaluate a simplified methodology for detection of human enteric viruses in sewage sludge. The method was based on viral elution with protein solution, followed by ultracentrifugation. Several parameters were evaluated, including time and elution pH, clarifying and purifying conditions. The method was applied to the detection of adenoviruses, hepatitis A virus and noroviruses in sewage sludge samples collected for twelve months at two sewage treatment plants in Sao Paulo state. Raw sewage samples were also collected as a reference for viral presence. PCR, RT-PCR and Real-Time PCR revealed the presence of adenoviruses, including the enteric ones (species F) and hepatitis A virus found both in sewage and sludge. Noroviruses were not detected in any samples. Cell culture infectious viruses were not detected in the sludge subjected to chemical treatment (STP A), and statistical analyses revealed the efficiency of this treatment for virus inactivation.
 
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Publishing Date
2008-09-24
 
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