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RESUMO OBJETIVO Estimar a soroprevalência de anticorpos do vírus SARS-CoV-2 em escolares de quatro a 14 anos de idade residentes no município de São Paulo, segundo variáveis clínicas, demográficas, epidemiológicas e sociais, durante o período de fechamento das escolas como medida de controle da covid-19. MÉTODOS Realizou-se um inquérito sorológico em setembro de 2020 com amostra aleatória estratificada por tipo de rede de ensino (pública municipal, pública estadual e privada). Foi coletada amostra de sangue venoso utilizando-se o teste de imunoensaio de fluxo lateral da fabricante Wondfo para detecção de anticorpos totais contra o vírus SARS-CoV-2. Aplicaram-se questionários semiestruturados para o levantamento de dados clínicos, demográficos, sociais e epidemiológicos. RESULTADOS A soroprevalência de anticorpos do vírus SARS-CoV-2 em escolares foi de 16,6% (IC95% 15,4–17,8). O estudo encontrou soroprevalências mais elevadas na rede pública municipal (18,5%; IC95% 16,6–20,6) e estadual (16,2%; IC95% 14,4–18,2) em relação à rede privada (11,7; IC95% 10,0–13,7) e entre escolares da raça/cor preta e parda (18,4%; IC95% 16,8–20,2) e no estrato social mais vulnerável (18,5%; IC95% 16,9–20,2). A pesquisa identificou menores soroprevalências nos escolares que relataram seguir as medidas recomendadas de proteção contra a covid-19. CONCLUSÃO A soroprevalência de anticorpos contra o vírus SARS-CoV-2 atinge principalmente os escolares socialmente mais vulneráveis. Este estudo pode contribuir para embasar políticas públicas que reforcem a importância da suspensão das aulas presenciais e da necessidade de estratégias de medidas de proteção e acompanhamento do status sorológico daqueles que ainda não foram contemplados no calendário vacinal.

ABSTRACT OBJECTIVE To estimate seroprevalence of SARS-CoV-2 antibodies in schoolchildren aged 4 to 14 years living in the city of São Paulo, according to clinical, demographic, epidemiological, and social variables, during the school closure period as a measure against covid-19 spread. METHODS A serological survey was made in September 2020 with a random sample stratified by school system (municipal public, state public and private) type. A venous blood sample was collected using the Wondfo SARS-CoV-2 Antibody Test (lateral flow method) for detection of total SARS-CoV-2 virus antibodies. Semi-structured questionnaires were applied to collect clinical, demographic, social, and epidemiological data. RESULTS Seroprevalence of SARS-CoV-2 antibodies in schoolchildren was of 16.6% (95%CI 15.4–17.8). The study found higher seroprevalence in the municipal (18.5%; 95%CI 16.6–20.6) and state (16.2%; 95%CI 14.4–18.2) public school systems compared to the private school system (11.7; 95%CI 10.0–13.7), among black and brown students (18.4%; 95%CI 16.8–20.2) and in the most vulnerable social stratum (18.5 %;95%CI 16.9–20.2). Lower seroprevalence was identified in schoolchildren who reported following the recommended protective measures against covid-19. CONCLUSION Seroprevalence of SARS-CoV-2 antibodies is found mainly in the most socially vulnerable schoolchildren. This study can contribute to support public policies that reinforce the importance of suspending face-to-face classes and developing strategies aimed at protective measures and monitoring of the serological status of those who have not yet been included in the vaccination schedule.

https://doi.org/10.11606/s1518-8787.2023057004782

Seroprevalence of SARS-CoV-2 antibodies in schoolchildren in the city of São Paulo, 2020
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Kamioka, Gabriela Akemi

; Madalosso, Geraldine

; Albuquerque, José Olimpio Moura de

; Costa, Selma Anequini

; Ferreira, Paula Bisordi

; Sato, Ana Paula Sayuri

; Glasser, Paula Regina

; Pino, Francisco Alberto

; Burihan, Patrícia Carla Piragibe Ramos

; Carvalho, Ana Carolina Aguiar de

; Amorim, Ana Beatriz Pagliaro

; Cavazzana, Cinthya Luzia

; Aires, Caroline Cotrim

; Kataoka, Ana Paula Arruda Geraldes

; Savani, Elisa San Martin Mouriz

; Bessa, Thirsa Alvares Franco

; Aguiar, Breno Souza de

; Failla, Marcelo Antunes

; Santos, Edson Aparecido dos

; Brito, Edjane Maria Torreão

; Santos, Maria Cristina Honório dos

; Caldeira, Luiz Artur Vieira

; Silva, Solange Maria Saboia e

; Zamarco, Luiz Carlos

; Fonseca, Sandra Maria Sabino

; Lima, Marcia Maria de Cerqueira

; Marques, Ivanilda Argenau

; Mauro, Athenê Maria de Marco França

; Masi, Eduardo de

Revista de Saúde Pública

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2023, Volume 57 elocation 6s

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

https://doi.org/10.11606/s1518-8787.2023057004782

Prevalence evolution of SARS-CoV-2 infection in the city of São Paulo, 2020–2021
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Albuquerque, José Olimpio Moura de

; Kamioka, Gabriela Akemi

; Madalosso, Geraldine

; Costa, Selma Anequini

; Ferreira, Paula Bisordi

; Pino, Francisco Alberto

; Sato, Ana Paula Sayuri

; Carvalho, Ana Carolina Aguiar de

; Amorim, Ana Beatriz Pagliaro

; Aires, Caroline Cotrim

; Kataoka, Ana Paula Arruda Geraldes

; Savani, Elisa San Martin Mouriz

; Bessa, Thirsa Alvares Franco

; Aguiar, Breno Souza de

; Failla, Marcelo Antunes

; Santos, Edson Aparecido dos

; Brito, Edjane Maria Torreão

; Santos, Maria Cristina Honório dos

; Silva, Solange Maria Saboia e

; Caldeira, Luiz Artur Vieira

; Zamarco, Luiz Carlos

; Fonseca, Sandra Maria Sabino

; Lima, Marcia Maria de Cerqueira

; Marques, Ivanilda Argenau

; Silva, Fabiana Érica Vilanova da

; Glasser, Paula Regina

; Burihan, Patrícia Carla Piragibe Ramos

; Cavazzana, Cinthya Luzia

; Mello, Debora Silva de

; Pellini, Alessandra Cristina Guedes

; Nishio, Fernando Yoshiki

; Kian, Fernanda Miyashiro

; Braga, Elza de Santana

; Bertelli, Nilza Maria Piassi

; Fracini, Wagner

; Gonçalves, Marcelo Dell Áquila

; Zular, Paulete Secco

; Piva, Regiane de Santana

; Masi, Eduardo

Revista de Saúde Pública

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2021, Volume 55 elocation 62

Abstract: En | Text: En | PDF: En

ABSTRACT OBJECTIVE To estimate the evolution of the prevalence of SARS-CoV-2 virus infection among residents aged 18 years or over in the municipality of São Paulo. METHODS This is a population-based household survey conducted every 15 days, between June and September 2020, and January and February 2021. In total, the study comprised 11 phases. The presence of antibodies against SARS-CoV-2 was identified in venous blood using a lateral flow test, Wondfo Biotech. In the last phase, the researchers combined it with an immunoenzymatic test, Euroimmun. The participants also answered a semi-structured questionnaire on sociodemographic and economic factors, and on social distancing measures. Prevalence estimates and the 95% confidence interval were estimated according to regions, Human Development Index, sex, age group, ethnicity, education, income, and variables associated with risk or prevention of infection. To compare the frequencies among the categories of each variable, the chi-square test with Rao-Scott correction was used, considering a significance level of 5%. RESULTS In total, 23,397 individuals were interviewed and had their samples collected. The estimated prevalence of antibodies against SARS-CoV-2 ranged from 9.7% (95%CI: 7.9–11.8%) to 25.0% (95%CI: 21.7–28.7). The prevalence of individuals with antibodies against the virus was higher among black and brown people, people with lower schooling and income, and among residents of regions with lower Human Development Index. The lowest prevalences were associated with recommended measures of disease protection. The proportion of asymptomatic infection was 45.1%. CONCLUSION The estimated prevalence of the infection was lower than the cumulative incidence variation, except for the last phase of the study. The differences in prevalence estimates observed among subpopulations showed social inequality as a risk of infection. The lower prevalence observed among those who could follow prevention measures reinforce the need to maintain social distancing measures as a way to prevent SARS-CoV-2 infection.

https://doi.org/10.11606/s1518-8787.2021055003970

Prevalence evolution of SARS-CoV-2 infection in the city of São Paulo, 2020–2021
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Albuquerque, José Olimpio Moura de

; Kamioka, Gabriela Akemi

; Madalosso, Geraldine

; Costa, Selma Anequini

; Ferreira, Paula Bisordi

; Pino, Francisco Alberto

; Sato, Ana Paula Sayuri

; Carvalho, Ana Carolina Aguiar de

; Amorim, Ana Beatriz Pagliaro

; Aires, Caroline Cotrim

; Kataoka, Ana Paula Arruda Geraldes

; Savani, Elisa San Martin Mouriz

; Bessa, Thirsa Alvares Franco

; Aguiar, Breno Souza de

; Failla, Marcelo Antunes

; Santos, Edson Aparecido dos

; Brito, Edjane Maria Torreão

; Santos, Maria Cristina Honório dos

; Silva, Solange Maria Saboia e

; Caldeira, Luiz Artur Vieira

; Zamarco, Luiz Carlos

; Fonseca, Sandra Maria Sabino

; Lima, Marcia Maria de Cerqueira

; Marques, Ivanilda Argenau

; Silva, Fabiana Érica Vilanova da

; Glasser, Paula Regina

; Burihan, Patrícia Carla Piragibe Ramos

; Cavazzana, Cinthya Luzia

; Mello, Debora Silva de

; Pellini, Alessandra Cristina Guedes

; Nishio, Fernando Yoshiki

; Kian, Fernanda Miyashiro

; Braga, Elza de Santana

; Bertelli, Nilza Maria Piassi

; Fracini, Wagner

; Gonçalves, Marcelo Dell Áquila

; Zular, Paulete Secco

; Piva, Regiane de Santana

; Masi, Eduardo

Revista de Saúde Pública

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2021, Volume 55 elocation 62

Abstract: En | Text: En | PDF: En

https://doi.org/10.11606/s1518-8787.2021055003970 43 downloads

Rabies virus monitoring in bat populations in Rondônia state, Brazil
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Almeida, Marilene Fernandes de

; Rosa, Adriana Ruckert da

; Martorelli, Luzia Fátima Alves

; Kataoka, Ana Paula Arruda Geraldes

; Aires, Caroline Cotrim

Revista da Sociedade Brasileira de Medicina Tropical

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2020, Volume 53 elocation e20200109

Abstract: En | Text: En | PDF: En

https://doi.org/10.1590/0037-8682-0109-2020 246 downloads

Rabies virus monitoring in bat populations in Rondônia state, Brazil
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Almeida, Marilene Fernandes de

; Rosa, Adriana Ruckert da

; Martorelli, Luzia Fátima Alves

; Kataoka, Ana Paula Arruda Geraldes

; Aires, Caroline Cotrim

Revista da Sociedade Brasileira de Medicina Tropical

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2019, Volume 52 elocation e20180199

Abstract: En | Text: En | PDF: En

Abstract INTRODUCTION: The Jirau hydroelectric power plant built in Rondônia state has environmental impacts that could be relevant to rabies outbreaks. METHODS: Bat populations were monitored for rabies by fluorescent antibody testing and simplified fluorescent inhibition microtesting between 2010 and 2015. RESULTS: All 1,183 bats tested negative for rabies. The prevalence of rabies antibodies was 17.5% in 1,049 bats. CONCLUSIONS: The rabies antibody dosage was not reactive in samples collected before the environmental changes, and there was a progressive increase in subsequent collections that could indicate an increase in rabies virus circulation among bats and risk of a rabies outbreak.

https://doi.org/10.1590/0037-8682-0199-2018 948 downloads

VIROLOGICAL AND SEROLOGICAL DIAGNOSIS OF RABIES IN BATS FROM AN URBAN AREA IN THE BRAZILIAN AMAZON
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OLIVEIRA, Rubens Souza de

; COSTA, Lanna Jamile Corrêa da

; ANDRADE, Fernanda Atanaena Gonçalves de

; UIEDA, Wilson

; MARTORELLI, Luzia Fátima Alves

; KATAOKA, Ana Paula de Arruda Geraldes

; ROSA, Elizabeth Salbé Travassos da

; VASCONCELOS, Pedro Fernando da Costa

; PEREIRA, Armando de Souza

; CARMO, Antônio Ismael Barros do

; FERNANDES, Marcus Emanuel Barroncas

Revista do Instituto de Medicina Tropical de São Paulo

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dec 2015, Volume 57 N. 6 Pages 497 - 503

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Os surtos de raiva em humanos transmitida por Desmodus rotundus em 2004 e 2005 no nordeste do estado do Pará, Brasil, Amazônia Oriental, fizeram desta uma área prioritária para estudos sobre essa zoonose. Diante disso, o presente estudo fornece dados sobre esse fenômeno em contexto urbano, afim de avaliar uma possível circulação do vírus clássico da raiva (RABV) entre espécies de morcegos em Capanema, cidade localizada na bacia Amazônica. Os morcegos foram coletados em 2011, com auxílio de redes de espera durante as estações seca e chuvosa. Amostras de encéfalo e de sangue foram coletadas para o diagnóstico virológico e sorológico, respectivamente. Das 153 amostras de encéfalo analisadas, nenhuma encontrou-se positiva para infecção pelo RABV, porém, 50,34% (95% CI: 45,67-55,01) das amostras de soro analisadas estavam soropositivas. Artibeus planirostris foi a espécie mais comum, e seu percentual de indivíduos soropositivos foi bem elevado (52.46%, 95% CI: 52,31-52,60). Porções estatisticamente iguais de soropositivos foram registrados nas estações (c2 = 0,057, d.f. = 1, p = 0,88). Uma porção significativamente elevada de machos (55,96%, 95% CI: 48,96%-62,96%), e adultos (52,37%, 95% CI: 47,35%-57,39%) foram soropositivos. Apesar de nenhuma das amostras de encéfalo terem sido positivas para raiva, a alta proporção de espécimes soropositivos indica uma possível circulação do RABV nessa área urbana.

The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005, in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a priority area for studies on this zoonosis. Given this, the present study provides data on this phenomenon in an urban context, in order to assess the possible circulation of the classic rabies virus (RABV) among bat species in Capanema, a town in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and dry seasons. Samples of brain tissue and blood were collected for virological and serological survey, respectively. None of the 153 brain tissue samples analyzed tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum samples analyzed were seropositive. Artibeus planirostris was the most common species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31 52.60%). Statistically, equal proportions of seropositive results were obtained in the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95% CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested positive for infection, the high proportion of seropositive specimens indicates that RABV may be widespread in this urban area.

https://doi.org/10.1590/S0036-46652015000600006 2113 downloads

Kinetics of rabies antibodies as a strategy for canine active immunization
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Babboni, Selene Daniela

; Costa, Hení Falcão da

; Martorelli, Luzia de Fátima Alves

; Kataoka, Ana Paula de Arruda Geraldes

; Victoria, Cassiano

; Padovani, Carlos Roberto

; Modolo, José Rafael

Journal of Venomous Animals and Toxins including Tropical Diseases

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2014, Volume 20 elocation 37

Abstract: En | Text: En | PDF: En

Background Rabies, a zoonosis found throughout the globe, is caused by a virus of theLyssavirus genus. The disease is transmitted to humans through the inoculation of the virus present in the saliva of infected mammals. Since its prognosis is usually fatal for humans, nationwide public campaigns to vaccinate dogs and cats against rabies aim to break the epidemiological link between the virus and its reservoirs in Brazil.Findings During 12 months we evaluated the active immunity of dogs first vaccinated (booster shot at 30 days after first vaccination) against rabies using the Fuenzalida-Palácios modified vaccine in the urban area of Botucatu city, São Pauto state, Brazil. Of the analyzed dogs, 54.7% maintained protective titers (≥0.5 IU/mL) for 360 days after the first vaccination whereas 51.5% during all the study period.Conclusions The present results suggest a new vaccination schedule for dogs that have never been vaccinated. In addition to the first dose of vaccine, two others are recommended: the second at 30 days after the first and the third dose at 180 days after the first for the maintenance of protective titers during 12 months.

https://doi.org/10.1186/1678-9199-20-37 709 downloads

Experimental infection of the bat tick Carios fonsecai (Acari: Ixodidae) with the rabies virus
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Favoretto, Silvana Regina

; Almeida, Marilene Fernandes de

; Martorelli, Luzia Fatima Alves

; Aires, Caroline Cotrin

; Labruna, Marcelo Bahia

; Kataoka, Ana Paula Arruda Geraldes

; Campos, Angelica Cristine de Almeida

; Sacramento, Debora Regina Veiga

; Durigon, Edison Luiz

; Koprowski, Hilary

Revista da Sociedade Brasileira de Medicina Tropical

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dec 2013, Volume 46 N. 6 Pages 788 - 790

Abstract: En | Text: En | PDF: En

Introduction This study assessed the viability of the rabies virus in the argasid tick Carios fonsecai following experimental infection. Methods The mouse inoculation test (MIT), fluorescent antibody test (FAT) and polymerase chain reaction (PCR) were used. The rabies virus was administered to ticks via the intra-coelomic route, and the ticks were sacrificed at different time points. Results The inoculated ticks were negative for rabies according to the MIT. Ticks macerated with rabies virus were positive according to the MIT and FAT. All of the tick lots tested by PCR were positive. Conclusions The rabies virus became unviable shortly after its inoculation into tick bodies. Ticks are not likely to play an important role in the epidemiology of rabies.

https://doi.org/10.1590/0037-8682-1673-2013 2192 downloads

10.

First report of rabies infection in bats, Molossus molossus, Molossops neglectus and Myotis riparius in the city of São Paulo, State of São Paulo, southeastern Brazil
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Rosa, Adriana Ruckert da

; Kataoka, Ana Paula de Arruda Geraldes

; Favoretto, Silvana Regina

; Sodré, Miriam Martos

; Trezza Netto, José

; Campos, Angélica Cristine de Almeida

; Durigon, Edison Luiz

; Martorelli, Luzia Fátima Alves

Revista da Sociedade Brasileira de Medicina Tropical

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apr 2011, Volume 44 N. 2 Pages 146 - 149

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

INTRODUÇÃO: Esse trabalho apresenta o primeiro registro de raiva em três espécies de morcegos: Molossus molossus, Molossops neglectus e Myotis riparius na Cidade de São Paulo, Brasil. MÉTODOS: Os morcegos foram diagnosticados como positivos para raiva usando as técnicas padrão de imunofluorescência direta e o teste de inoculação em camundongo. Os isolados foram caracterizados antigenicamente usando um painel de oito anticorpos monoclonais (CDC/Atlanta/USA). As amostras também foram analisadas geneticamente por sequenciamento parcial do gene da nucleoproteína entre as posições 1157 e 1445nt. RESULTADOS: O resultado das análises mostrou que as amostras isoladas da espécie M. molossus apresentou variante antigênica 6, enquanto as outras duas amostras mostraram um perfil diferente daquele estabelecido no painel e ainda não registrado em literatura. Os resultados da analise genética revelaram que a amostra de M. molossus segrega com isolados de Lasiurus sp., M. neglectus segrega com o isolado do subgrupo de Eptesicus furinalis e uma amostra de M. riparius segrega com isolados de Myotis sp. CONCLUSÕES: Os casos relatados neste estudo enfatizam a necessidade do esclarecimento da ocorrência de casos de raiva em morcegos, principalmente em áreas urbanas.

INTRODUCTION: This paper presents the first report of rabies in three bat species, Molossus molossus, Molossops neglectus and Myotis riparius in the city of São Paulo, Brazil. METHODS: Bats were diagnosed as positive for rabies using the fluorescent antibody test and mouse inoculation test. The isolates were characterized antigenically using a panel of eight monoclonal antibodies. The samples were also genetically analyzed by partial sequencing of the portion of nucleoprotein gene between positions 1157 and 1445nt. RESULTS: Analysis of the results verified that the sample isolated from the species M. molossus presented antigenic variant 6, while the other two samples showed a different profile from that established in the panel, one not previously reported in the literature. The results of genetic analysis revealed that the M. molossus sample segregated with Lasiurus sp. isolates, M. neglectus segregated with a subgroup of Eptesicus furinalis isolates and the Myotis riparius sample segregated with Myotis sp. isolates. CONCLUSIONS: The cases reported in this paper emphasize the need for clarification of the circumstances in which cases of rabies in wildlife occur, principally in urban areas.

2208 downloads Cited 2 times in SciELO

11.

Rabies diagnosis and serology in bats from the State of São Paulo, Brazil
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Almeida, Marilene Fernandes de

; Martorelli, Luzia Fátima Alves

; Sodré, Miriam Martos

; Kataoka, Ana Paula Arruda Geraldes

; Rosa, Adriana Ruckert da

; Oliveira, Maria Lucia de

; Amatuzzi, Elizabeth

Revista da Sociedade Brasileira de Medicina Tropical

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apr 2011, Volume 44 N. 2 Pages 140 - 145

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

INTRODUÇÃO: Morcegos são um dos mais importantes reservatórios e vetores do vírus da raiva no mundo. MÉTODOS: No período entre 1998 e 2003, o Centro de Controle de Zoonoses da Cidade de São Paulo realizou o diagnóstico de raiva em 5.670 morcegos utilizando as técnicas de imunofluorescência direta e inoculação intracerebral em camundongos. Sangue foi coletado de 1.618 espécimes para pesquisa de anticorpos pela técnica de inibição de foco de fluorescência rápida. RESULTADOS: Quarenta e quatro (0,8%) morcegos foram positivos para raiva. A prevalência de anticorpos foi de 5,9% usando 0,5UI/ml como ponto de corte. Os morcegos de hábito alimentar insetívoro (69,8%) e os morcegos da espécie Molossus molossus (51,8%) representaram a maioria da amostra. Entretanto, as mais altas prevalências de anticorpos foram observadas nos morcegos Glossophaga soricina (14/133), Histiotus velatus (16/60), Desmodus rotundus (8/66), Artibeus lituratus (5/54), Nyctinomops macrotis (3/23), Tadarida brasiliensis (3/48), Carollia perspicillata (3/9), Eumops auripendulus (2/30), Nyctinomops laticaudatus (2/16), Sturnira lilium (2/17) e Eumops perotis (1/13). A prevalência de anticorpos foi analisada por espécie, hábito alimentar e sexo. CONCLUSÕES: O expressivo nível de anticorpos associado à baixa positividade para o vírus da raiva entre os morcegos estudados indica que o vírus circula ativamente entre morcegos.

INTRODUCTION: Bats are one of the most important reservoirs and vectors of the rabies virus in the world. METHODS: From 1988 to 2003, the Zoonosis Control Center in São Paulo City performed rabies diagnosis on 5,670 bats by direct immunofluorescent test and mouse inoculation test. Blood samples were collected from 1,618 bats and the sera were analyzed using the rapid fluorescent focus inhibition test to confirm rabies antibodies. RESULTS: Forty-four (0.8%) bats were positive for rabies. The prevalence of rabies antibodies was 5.9% using 0.5IU/ml as a cutoff. Insectivorous bats (69.8%) and bats of the species Molossus molossus (51.8%) constituted the majority of the sample; however, the highest prevalence of antibodies were observed in Glossophaga soricina (14/133), Histiotus velatus (16/60), Desmodus rotundus (8/66), Artibeus lituratus (5/54), Nyctinomops macrotis (3/23), Tadarida brasiliensis (3/48), Carollia perspicillata (3/9), Eumops auripendulus (2/30), Nyctinomops laticaudatus (2/16), Sturnira lilium (2/17) and Eumops perotis (1/13). The prevalence of rabies antibodies was analyzed by species, food preference and sex. CONCLUSIONS: The expressive levels of antibodies associated with the low virus positivity verified in these bats indicate that rabies virus circulates actively among them.

3909 downloads Cited 3 times in SciELO

12.

Laboratory study on the bioremediation of diesel oil contaminated soil from a petrol station
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Mariano, Adriano Pinto

; Kataoka, Ana Paula de Arruda Geraldes

; Angelis, Dejanira de Franceschi de

; Bonotto, Daniel Marcos

Brazilian Journal of Microbiology

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jun 2007, Volume 38 N. 2 Pages 346 - 353

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

O objetivo do presente estudo foi investigar possíveis métodos para aumentar a taxa de biodegradação aeróbia de hidrocarbonetos (tratamentos ex-situ). Neste trabalho, processos de biorremediação foram aplicados a um solo arenoso com alto nível de contaminação ocasionada por um vazamento de um tanque de armazenamento de óleo diesel subterrâneo em um posto de combustíveis. Experimentos em escala laboratorial (respirômetros de Bartha) foram utilizados para avaliar a biodegradação do óleo diesel. Estímulo da biodegradação foi realizado utilizando-se as técnicas de bioestímulo (adição de soluções de nitrogênio e fósforo ou surfactante Tween 80) e de bioaumento (consórcio bacteriano isolado de um sistema de landfarming). Para investigar as interações entre os fatores otimizadores, e encontrar a melhor combinação entre esses agentes, o estudo foi baseado em um delineamento experimental fatorial completo. A eficiência de biodegradação foi simultaneamente medida com dois métodos: respirométrico (produção de CO2 microbiano) e cromatografia gasosa. Testes de toxicidade aguda com Daphnia similis foram aplicados para examinar a eficiência dos processos em termos de geração de produtos menos tóxicos. Resultados mostraram que todas as estratégias de biorremediação aceleraram a biorremediação natural do solo contaminado e os melhores resultados foram obtidos quando os tratamentos tinham adição de nutrientes. Dados respirométricos indicaram uma máxima mineralização de hidrocarbonetos de 19,8%, obtida com a combinação dos três agentes, com uma remoção de hidrocarbonetos totais de petróleo (TPH) de 45,5% em 55 dias de tratamento. No final dos experimentos, duas espécies predominantes de bactéria foram isoladas e identificadas como Staphylococcus hominis e Kocuria palustris.

The purpose of the present study was to investigate possible methods to enhance the rate of aerobic biodegradation of hydrocarbons (ex-situ treatments). In this work, the bioremediation processes were applied to a sandy soil with a high level of contamination originated from the leakage of a diesel oil underground storage tank at a petrol station. Laboratory scale experiments (Bartha biometer flasks) were used to evaluate the biodegradation of the diesel oil. Enhancement of biodegradation was carried out through biostimulation (addition of nitrogen and phosphorus solutions or Tween 80 surfactant) and bioaugmentation (bacterial consortium isolated from a landfarming system). To investigate interactions between optimizing factors, and to find the right combination of these agents, the study was based on full factorial experimental design. Efficiency of biodegradation was simultaneously measured by two methods: respirometric (microbial CO2 production) and gas chromatography. Acute toxicity tests with Daphnia similis were applied for examination of the efficiency of the processes in terms of the generation of less toxic products. Results showed that all bioremediation strategies enhanced the natural bioremediation of the contaminated soil and the best results were obtained when treatments had nutritional amendment. Respirometric data indicated a maximum hydrocarbon mineralization of 19.8%, obtained through the combination of the three agents, with a total petroleum hydrocarbons (TPH) removal of 45.5% in 55 days of treatment. At the end of the experiments, two predominant bacteria species were isolated and identified (Staphylococcus hominis and Kocuria palustris).

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