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Brazilian Journal of Biology

versión impresa ISSN 1519-6984

Braz. J. Biol. vol.72 no.2 São Carlos mayo 2012

http://dx.doi.org/10.1590/S1519-69842012000200013 

ECOLOGY

 

First description of Adenovirus, Enterovirus, Rotavirus and Torque teno virus in water samples collected from the Arroio Dilúvio, Porto Alegre, Brazil

 

Primeira descrição de Adenovírus, Enterovírus, Rotavírus e Torque teno vírus em amostras de água coletadas do Arroio Dilúvio, Porto Alegre, Brasil

 

 

Vecchia, AD.I, II; Fleck, JD.I, II; Comerlato, J.III; Kluge, M.II; Bergamaschi, B.III; Da Silva, JVS.II; Da Luz, RB.II; Teixeira, TF.II; Garbinatto, GN.IV; Oliveira, DV.IV; Zanin, JG.IV; Van der Sand, S.IV; Frazzon, APG.IV; Franco, AC.III; Roehe, PM.III, V; Spilki, FR.I, II, *

IPrograma de Pós-Graduação em Qualidade Ambiental, Universidade Feevale, CEP 93352-000, Novo Hamburgo, RS, Brazil
IILaboratório de Microbiologia Molecular, Instituto de Ciências da Saúde, Universidade Feevale, CEP 93352-000, Novo Hamburgo, RS, Brazil
IIILaboratório de Virologia, Departamento de Microbiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Sarmento Leite, 500, CEP 90050-170, Porto Alegre, RS, Brazil
IVDepartamento de Microbiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Sarmento Leite, 500, CEP 90050-170, Porto Alegre, RS, Brazil
VInstituto de Pesquisa Veterinária "Desidério Finamor" - IPVDF, Fundação Estadual de Pesquisa Agropecuária - FEPAGRO-Saúde Animal, Estrada do Conde, 6000, CEP 92990-000, Eldorado do Sul, RS, Brazil

 

 


ABSTRACT

Adenovirus (AdV), enterovirus (EV), genogroup A rotaviruses (GARV) and Torque teno virus (TTV) are non-enveloped viral agents excreted in feces and so may contaminate water bodies. In the present study, the molecular detection of these viruses was performed in samples of surface water collected from the Arroio Dilúvio, a waterstream that crosses the city of Porto Alegre, RS, Brazil, receiving great volumes of non-treated sewage from a large urban area. Sampling was performed during 2009, in three different occasions (January, April and September). The highest detection rate was observed for EV (64.28%), followed by TTV (28.57%) and AdV (21.43%). Rotaviruses were not detected. More than on kind of tested virus was detected in five (35. 71%) of 14 samples. January was the month with the highest viral detection rate, being all samples, collected in this month, positive for at least one group of tested virus. The correlation between the detection of these different viral agents and environmental factors is discussed. To the knowledge of the authors, this is the first description of viral genomes in water samples taken from the Arroio Dilúvio, Porto Alegre (Brazil).

Keywords: adenovirus, enterovirus, rotavirus, Torque teno virus, viral analysis of water.


RESUMO

Adenovírus (AdV), enterovírus (EV), rotavírus (GARV) e Torque teno vírus (TTV) são vírus não envelopados, excretados nas fezes, podendo, assim, contaminar corpos hídricos. No presente estudo, a detecção molecular desses agentes foi realizada em amostras de águas superficiais provenientes do Arroio Dilúvio, o qual cruza a cidade de Porto Alegre-RS, Brasil. As amostras foram coletadas em três meses diferentes (janeiro, abril e setembro) do ano de 2009. A maior taxa de detecção viral foi observada para EV (64,28%), seguida por TTV (28,57%) e AdV (21,43%). Rotavírus não foi detectado. Foi verificada presença simultânea de dois grupos virais em cinco (35,71%) das 14 amostras analisadas. Janeiro foi o mês com a maior taxa de detecção viral, sendo todas as amostras, coletadas nesse mês, positivas para, no mínimo, um grupo viral em estudo. A correlação entre a detecção desses diferentes agentes virais e os fatores ambientais é discutida. Conforme conhecimento dos autores, essa é a primeira descrição de genomas virais em amostras de água provenientes do Arroio Dilúvio, Porto Alegre, Brasil.

Palavras-chave: adenovirus, enterovírus, rotavirus, Torque teno virus, análise virológica da água.


 

 

1. Introduction

Water quality may be greatly affected by the presence of pathogenic microorganisms derived from fecal pollution. Currently, the microbiological monitoring of water is mainly done by detection of total and fecal coliforms (WHO, 2008). Nevertheless, the lack of these pathogens does not exclude the putative fecal contamination with different viruses excreted in feces from both ill and asymptomatic individuals (Goyal et al., 1984; Jiang and Chu, 2004; Fong et al., 2005). These agents are often collectively named enteric viruses, whereas they are excreted by fecal route and their replication occur in the gastrointestinal tract of the hosts.

The majority of these viruses is non-enveloped, which makes them highly resistant in the water environment (Sobsey and Meschke, 2003; Bosch et al., 2006). The most commonly studied species of enteric viruses are enterovirus (EV), adenovirus (AdV), genogroup A rotaviruses (GARV), hepatitis A and E viruses and more recently, norovirus (Leclerc et al., 2002; Fong and Lipp, 2005; Abdel-Moety et al., 2008; Gibson et al., 2011). Similarly to enteric viruses, Torque teno virus (TTV), an emerging virus discovered from hepatitis patients and healthy persons as well, has a similar behaviour: it is relatively resistant to heat inactivation and also excreted by the fecal route (Bendinelli et al., 2001).

Unlike microorganisms routinely analysed, such as Escherichia coli, viruses remain infectious for longer periods in the environment (Sobsey and Meschke, 2003). Additionally, non-enveloped viruses are more resistant to decontamination processes used in both drinking and wastewater treatments as well as being more species-specifical than bacteria, which may indicate them as candidates for microbial source tracking (Noble et al., 2003; Fong et al., 2005). Therefore, the analysis of viruses in conjunction with bacteria may be advantageous for detection and identification of sources for fecal contamination.

Among enteric virus, AdV and EV have been suggested particularly as efficient indicators for the monitoring of fecal contamination (Hot et al., 2003; Fong and Lipp, 2005). AdV are members of Adenoviridae family - and can cause gastroenteritis, conjunctivitis, cystitis, as well as respiratory infections (ICTV, 2009; Lenaerts et al., 2008). When compared with other enteric viruses, AdV show higher resistance to UV light inactivation used in drinking and wastewater treatments (Gerba et al., 2002; Nwachuku et al., 2005). Enteroviruses belong to the Enterovirus genus of the Picornaviridae family, order Picornavirales (ICTV, 2009). Most of these viruses cause asymptomatic infections in humans; however, some may be involved with mild respiratory illness, aseptic meningitis, acute flaccid paralysis, myocardits and others clinical outcomes (Pallansch and Roos, 2001). Both enteroviruses and adenoviruses occur especially in children and immunocompromised hosts (Fong and Lipp, 2005; Palacios and Oberste, 2005).

Rotaviruses are members of the Reoviridae family, genus Rotavirus (ICTV, 2009). The genogroup A within the Rotavirus genus is by far recognised as the most important etiologic agent of severe diarrhea illness of infants and young children worldwide and vaccination is now being widely used for protection of children (Caprioli et al., 1996; Midthun and Kapikian, 1996; Kapikian et al., 2001).

TTV is currently classified within the Anelloviridae family (ICTV, 2009). It may infect many vertebrate species, including humans. To date, however, there is no consensus about the role of TTV infection and overt of clearly noticeable disease in human beings.

Arroio Dilúvio is a canalised waterstream that crosses Porto Alegre city, the Southern-most state capital in Brazil, with approximately 1.500.000 inhabitants. The canalised portion of Arroio Dilúvio comprises a path of approximately 12 km, flowing into the Lake Guaíba, which is the main source of water supply for Porto Alegre (Porto Alegre, 2011). In 1998, 446 thousand inhabitants of Porto Alegre contributed to the sub-basin of the Arroio Dilúvio, which corresponded to one third of the population of the city (Menegat, 1998). So, the present study aimed to evaluate the viral contamination of surface water collected from Arroio Dilúvio through detection of AdV, EV, GARV and TTV genomes.

 

2. Material and Methods

2.1. Study area

The samples were collected from five points along the course of Arroio Dilúvio, which traverses a path of about 17 km from its origin until it reaches the Lake Guaíba (Menegat, 1998). The location of sampling points is shown in Figure 1.

2.2. Water sample collection

Water samples (500 mL) were collected aseptically, taken directly from the superficial water, in sterilised glass bottles. The samples were transported to the laboratory under refrigeration (4 °C), and were kept under this condition until sample concentration. The sampling occurred in 2009, in three different dates: January 27, April 27 and September 1.

2.3. Sample concentration

Putative viral particles present on the samples were concentrated using an adsorption-elution method with negatively charged membranes (HA, Millipore, USA), as described previously by Katayama et al. (2002) with minor modifications. Briefly, 500 mL of each water sample was mixed with 0.3 g MgCl2 and pH adjusted to 5.0 with 10% HCl. Subsequently, the resulting mixture was filtered through a type HA negatively charged sterile membrane (0.45 µm pore size; 47 mm diameter). The membrane was rinsed with 87.5 mL of 0.5 mm H2SO4 (pH 3.0), followed by elution of viral particles adsorbed to the membrane with 2.5 mL of 1 mm NaOH (pH 10.5). The filtrate was then neutralised with 12.5 µL of 50 mm H2SO4 and 12.5 µL of 100x Tris-EDTA (TE) buffer. The resulting mixture was aliquoted and stored at -80 °C until further processing.

2.4. Viral nucleic acid extraction

Viral nucleic acids (RNA, EV and GARV; DNA, AdV and TTV) were extracted from 400 µL of the concentrated sample using the RTP® DNA/RNA Virus Mini Kit (Invitek, Berlin, Germany) according to the manufacturer's instructions. The viral RNA or DNA so obtained was kept at -80 °C until analysis.

2.5. Polymerase chain reaction (PCR) protocols for the detection of enteric viruses

For EV and GARV, an additional step was performed before amplification, i.e. synthesis of cDNA, which was achieved with a High Capacity cDNA Reverse Transcription commercial kit (Applied Biosciences, USA), with the aid of random primers, following the manufacturer's instructions.

After previous assays to achieve optimal conditions, PCR reactions were standardised and carried out as follows: a) AdV and GARV: 50 µL reaction mixtures consisting 25 µL of GoTaq® Green Master Mix (Promega), 18 µL of nuclease-free water, 1 µL of each primer (20 pM) and 5 µL of nucleic acid; b) EV: 25 µL final volume containing 12,5 µL of 2x PCR Master Mixtm (LGCbio, Brazil), 7,5 µL of nuclease-free water, 1 µL of each primer (20 pM) and 3 µL of cDNA product; c) TTV: final volume of 50 µL containing 25 µL of 2x PCR Master Mixtm (LGCbio, Brazil), 22,5 µL of nuclease-free water, 0.5 µL of each primer (20 pM) and 1.0 µL of extracted DNA. DNase/RNase free water was used as a negative control during all PCR reactions. The positive controls used in amplifications were Poliovirus-1 (Sabin strain), kindly provided by Dr. Carlos Nozawa; AdV types 2 and 5, kindly provided by Dr. Célia Barardi; Human-GARV (VP6 I-2 Genotype), isolated from a clinical sample collected in the municipality of Porto Alegre, and a 100-fold diluted solution containing a TTSV (Torque Teno Sus Virus) cloned genome. The sequences of the primers and their location in the viruses' genomes are given in Table 1.

Amplification was performed using a thermal cycler (MultiGene, Labnet International, USA). The PCR conditions were optimised for each virus group and were as follows: a) AdV: 98 °C for 7 minutes, 40 cycles of 94 °C for 1 minute, 55 °C for 1 minute, 72 °C for 1 minute; b) EV: 98 °C for 5 minutes, 35 cycles of 94 °C for 1 minute, 56 °C for 1 minute, 72 °C for 1 minute; c) GARV: 94 °C for 5 minutes, 40 cycles of 94 °C for 1 minute, 54 °C for 1 minute (which was decreased by 0.5 °C at each of the 39 subsequent cycles), 72 °C for 1 minute; d) TTV: 94 °C for 2 minutes, 40 cycles of 94 °C for 1 minute, 59 °C for 30 seconds, 72 °C for 30 seconds. After cycles all reactions were left at 72 °C for 7 minutes for final elongation.

The sensibility of the assays was determined using 10-fold serial dilutions of each DNA/RNA standard. EV-PCR has shown to detect a minimum of 0.316 tissue culture infective doses (TCID50) of experimentally contaminated water, to AdV-PCR this value was 0.562 TCID50. To determine the TTV-PCR sensibility an additional step was required before serial dilution, i.e. plasmid cloning. This assay was able to detect 10 DNA plasmids copies. On the specific case of GARV, the amount of DNA used for amplification was measured by comparison with Low Mass DNA ladder (Invitrogen, USA) and determined as 200 ng.

After the reactions, PCR products were stained with nontoxic fluorescent dye, Blue Green (LGCBio, Brazil), analyzed by electrophoresis on 2% (w/v) agarose gel and visualised under an ultraviolet (UV) light source.

 

3. Results

Water samples were taken at five sampling sites along the waterstream Arroio Dilúvio, in three different dates, January 27, April 27 and September 1. Fourteen water samples were analysed by conventional PCR for the presence of AdV, EV, GARV and TTV. EV showed the highest detection rate (64.28%), followed by TTV (28.57%) and AdV (21.43%). All samples were negative for GARV. Results are summarised in Table 2.

January was the month with the highest viral detection rate. All sampling points showed the presence of at least one group of virus, with detection of EV in four out of five samples analysed. The massive presence of EV was also observed in April, which was found in all sampling points. The lowest viral detection rate was recognised in September, with only one positive water sample, in which was detected AdV.

Among the samples analysed, point 3 showed the highest viral detection, being detected AdV and EV in January, EV and TTV in April and AdV in September. This point is located in a region considered of medium impact, according to Menegat (1998), since it is in the middle section of the course and receives wastewater from an urban region. However, viral detection (EV) was observed even at the source of the waterstream (point 1 - into Saint Hilaire Park), in January and April.

 

4. Discussion

Porto Alegre city, the southernmost large urban area in Brazil, is crossed by Arroio Dilúvio, a canalised waterstream that flows into the Lake Guaíba, the main source of water supply of this same municipality. This waterstream receives untreated sewage of at least one third of the population of the city. In the present study, the fecal contamination in surface water was evaluated by detection of AdV, EV, GARV and TTV. High viral detection rates were identified in January and April, being EV the main virus group detected. However, all samples collected in September were negative for EV. These events were not related with the mass Polio Vaccination Campaigns (implemented twice a year in Brazil by the Ministry of Health), which, in 2009, were held in June 20th and September 19th (DATASUS, 2011).

Meteorological data, such as precipitation, mean temperature, maximum and minimum temperatures and relative humidity (Table 3), were analysed in order to interpret those results. With respect to monthly precipitation data, apparently there could be a relationship between the difference in the EV frequency and precipitation values. Nevertheless, when daily precipitation data were available, it was verified that no association can be performed, since all samples were collected in the absence of rain, condition observed during, at least, six consecutive days before sampling days. Other parameters may be associated to viral detection rate, such as water temperature, air humidity, solar insolation, wind speed, wind direction and turbidity (Wong et al., 2009). However, in this case, the anthropogenic factor, i.e. discharge of sewage in Arroio Dilúvio, is the major factor to viral detection.

 

 

In this study, AdV was detected only in three water samples (two in January and one in September), i.e. 21.43%. Although many reports have been published regarding higher incidence of AdV when compared to EV in water samples, maybe because AdV genome is composed by double-stranded DNA, so it is potentially more stable to adverse conditions (as, for example, UV irradiation), some authors have verified higher EV detection rates. Fong et al. (2005) evaluate the presence of EV, AdV and bovine enterovirus (BEV) in water samples from Altamaha River (Georgia). The authors detected EV in 57% of surface water samples, while only 37% of samples were positive for AdV. Slightly higher EV detection was also related to Lee et al. (2005), who detected EV in 33.3% of surface water samples collected from Han River (Seoul, Korea) and AdV in 30.4% of samples. Chapron et al. (2000) verified a similar situation, with higher EV detection (58.6%) than AdV (48.3%) in surface water samples.

Despite the high prevalence of TTV (92%) having been reported by Diniz-Mendes et al. (2008) in samples taken from a stream located in Manaus (Brazil), the TTV detection rate found in this study was not high, since only 28.57% of water samples analysed were positive for TTV. Other studies also showed lower TTV levels in water than those observed by Diniz-Mendes et al. (2008). For example, Verani et al. (2006) detected TTV presence in only 25% of water samples from a river in Italy. A lower TTV detection rate has been verified by Haramoto et al. (2005), who detected TTV in 5% of surface water samples, in Japan.

Bacterial analysis was performed to water samples collected from Arroio Dilúvio. The results showed the presence of Enteroccocus, Staphylococcus, E. coli, Shighella, Salmonella (data not shown, personal communication). Enteroccocus, E. coli, Shighella, Salmonella were detected in all sampling points, while Staphylococcus were found in four sampling points. Detection of E. coli and enteric viruses in all points tested demonstrates the presence of fecal contamination in Arroio Dilúvio. Since this waterstream flowing into the Lake Guaíba, which is the main source of water supply for Porto Alegre, the need for the development of appropriate wastewater treatment is emphasized, as well as water treatment, mainly considering the high resistance of enteric viruses in the water environment. Further, the host specificity of enteric viruses suggest that they can be promising markers of microbial source tracking, as well as the chance of the human population getting viral infections through contaminated water being largely determined by the degree of exposure to human sewage. Therefore, it is advisable to include enteric viruses in water quality monitoring programmes, which facilitate the identification of the source of contamination.

This is the first report showing the description of viral genomes in water samples taken from the Arroio Dilúvio, Porto Alegre (Brazil), to the knowledge of the authors. According to the obtained results, the enterovirus genus may be advisable as a marker of viral contamination in this particular environment, in view of the high prevalence observed. Nevertheless, further studies should be conducted in order to perform more frequent samplings and to evaluate the viral viability in cell cultures, as well as to characterize the genomic sequences found.

Acknowledgements - Financial support for this work was from the Universidade Feevale and Brazilian Research Agencies: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS). We would like to thank Dr. Carlos Nozawa (Departamento de Microbiologia, UEL, Brazil) who kindly supplied the Poliovirus-1 (Sabin strain) and Dr. Célia Barardi (Departamento de Microbiologia, Imunologia e Parasitologia, UFSC, Brazil) for kindly providing the Adenovirus types 2 and 5. F.R.S., A.C.F. and P.M.R. are Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) research fellows.

 

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Received May 11, 2011
Accepted July 14, 2011
Distributed May 31, 2012

 

 

* e-mail: fernandors@feevale.br

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