Asthma exacerbations in a subtropical area and the role of respiratory viruses:a cross-sectional study

Background: Multiple factors are involved in asthma exacerbations, including environmental exposure and viral infections. We aimed to assess the association between severe asthma exacerbations, acute respiratory viral infections and other potential risk factors. Methods: Asthmatic children aged 4-14 years were enrolled for a period of 12 months and divided into two groups: those with exacerbated asthma (group 1) and non-exacerbated asthma (group 2). Clinical data were obtained and nasopharyngeal samples were collected through nasopharyngeal aspirate or swab and analysed via indirect fluorescent immunoassays to detect influenza A and B viruses, parainfluenza 1-3, adenovirus and respiratory syncytial virus. Rhinovirus was detected via molecular assays. Potential risk factors for asthma exacerbation were identified in univariate and multivariate analyses. Results: In 153 children (group 1: 92; group 2: 61), median age 7 and 8 years, respectively, the rate of virus detection was 87.7%. There was no difference between groups regarding the frequency of virus detection (p = 0.68); however, group 1 showed a lower frequency (19.2%) of inhaled corticosteroid use (91.4%, p <0.01) and evidence of inadequate disease control. In the multivariate analysis, the occurrence of three or more visits to the emergency room in the past 12 months (IRR = 1.40; p = 0.04) and nonadherence to inhaled corticosteroid (IRR = 4.87; p <0.01) were the only factors associated with exacerbation. Conclusion: Our results suggest an association between asthma exacerbations, poor disease control and nonadherence to asthma medication, suggesting that viruses may not be the only culprits for asthma exacerbations in this population

Molecular characterization of group A rotavirus before and after the introduction of vaccines in Brazil

Submitted by Luciana Ferreira ([email protected]) on 2018-07-18T12:24:02Z No. of bitstreams: 2 Artigo - Tâmera Nunes Vieira Almeida - 2015.pdf: 717758 bytes, checksum: 9e76fb4b2d7b4c6a668e63b935e587b3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira ([email protected]) on 2018-07-19T11:51:03Z (GMT) No. of bitstreams: 2 Artigo - Tâmera Nunes Vieira Almeida - 2015.pdf: 717758 bytes, checksum: 9e76fb4b2d7b4c6a668e63b935e587b3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-07-19T11:51:03Z (GMT). No. of bitstreams: 2 Artigo - Tâmera Nunes Vieira Almeida - 2015.pdf: 717758 bytes, checksum: 9e76fb4b2d7b4c6a668e63b935e587b3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2015-10Introduction: In this study, the molecular characteristics of group A rotavirus (RVA) were compared in samples obtained before and after RVA vaccine-introduction in Brazil. Methods: Eighty samples were screened for the presence of RVA. Positive samples were molecularly analyzed. Results: RVA positivity was 16.9%, with a predominance of G2P[4]. Periods: pre-vaccination: predominance of IId (G1), IId (G2) lineages, and I1 and E1 genotypes; post-vaccination: predominance of Ib (G1), IIa, and IIc (G2) lineages and I2 and E2 genotypes. Conclusions: Although changes in RVA-circulation pattern were observed in the post-vaccination period, it could not be attributed to vaccination process

Human bocavirus 1 and 3 infection in children with acute gastroenteritis in Brazil

Submitted by Luciana Ferreira ([email protected]) on 2018-07-18T12:49:38Z No. of bitstreams: 2 Artigo - Teresinha Teixeira de Sousa - 2012.pdf: 486062 bytes, checksum: f45e1dde627be1d271b2cb6c46803c13 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira ([email protected]) on 2018-07-19T11:52:17Z (GMT) No. of bitstreams: 2 Artigo - Teresinha Teixeira de Sousa - 2012.pdf: 486062 bytes, checksum: f45e1dde627be1d271b2cb6c46803c13 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-07-19T11:52:17Z (GMT). No. of bitstreams: 2 Artigo - Teresinha Teixeira de Sousa - 2012.pdf: 486062 bytes, checksum: f45e1dde627be1d271b2cb6c46803c13 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2012-09To determine the positivity rate of human bocavirus (HBoV) 1 and 3 among children who presented with acute gastroenteritis symptoms during the period of 1994-2004 in the Central-West Region of Brazil, 762 faecal samples were tested using polymerase chain reaction (PCR) for the detection of HBoV DNA. Primers for a segment of the non-structural viral protein 1 (NS1) gene of HBoV-1 and HBoV-3 were used. Twelve HBoV-positive samples were further characterised via genomic sequencing and phylogenetic analysis. Of the samples tested, 5.8% (n = 44) were positive for HBoV-1 or HBoV-3 and co-infection was observed in 14 (31.8%) of the 44 HBoV-positive samples. Nine of the 14 samples were also positive for Rotavirus A and five were positive for Aichi virus. The genomic sequencing of the NS1 partial sequence of 12 HBoV-samples showed that 11 samples were characterised as HBoV-1 and that one was characterised as HBoV-3. The phylogenetic analysis showed that the HBoV-1 samples had a high sequence homology to others previously identified in China, Sweden and Brazil. This is the first study conducted in the Cen- tral-West Region of Brazil to detect HBoV-1 and HBoV-3 in faecal samples from children with acute gastroenteritis. Further studies are required to define the role of HBoVs as aetiological agents of gastroenteritis

Gastroenteric virus detection in fecal samples from women in Goiânia, State of Goiás, Brazil Detecção de vírus gastroentéricos em amostras fecais de mulheres em Goiânia, Estado de Goiás, Brasil

INTRODUCTION: This was a prospective study that included women seen in the obstetrics and gynecology sector of Hospital das Clínicas, Federal University of Goiás, in Goiânia, State of Goiás, with the aim of detecting rotaviruses, adenoviruses, caliciviruses and astroviruses. Eighty-four women participated in the study and from these, 314 fecal samples were collected. Out of all of the women, 29 were seropositive for HIV and 55 were seronegative, and 45 and 39 were pregnant and non-pregnant, respectively. METHODS: Fecal samples were collected from each woman once every two months over the period from July 2006 to June 2007, and they were screened for rotaviruses by means of polyacrylamide gel electrophoresis and immunoenzymatic assays, for caliciviruses and astroviruses by means of RT-PCR and for adenovirus by means of immunoenzymatic assays. The astroviruses were genotyped using nested PCR. RESULTS: Among the 84 patients, 19 (22.6%) were positive for either calicivirus (14/19) or astrovirus (6/19), while one women was positive for both viruses in fecal samples collected on different occasions. Most of the positive samples were collected during the months of July and August (astrovirus) and September and October (calicivirus). None of the samples analyzed was positive for rotavirus or adenovirus. Gastroenteric viruses were detected in 13/19 (68.4%) of the pregnant women, whether HIV-seropositive or not. CONCLUSIONS: The results from the present study showed that neither pregnancy nor HIV-seropositive status among the women increased the risk of infection by any of the gastroenteric viruses studied. This study presents data on gastroenteric virus detection among pregnant and/or HIV-positive women.<br>INTRODUÇÃO: Este foi um estudo prospectivo que incluiu mulheres atendidas no setor de obstetrícia e ginecologia do Hospital das Clínicas da Universidade Federal de Goiás, em Goiânia, Estado de Goiás com o objetivo de detectar rotavírus, adenovírus, calicivírus e astrovírus. Oitenta e quatro mulheres participaram no estudo e destas, 314 amostras fecais foram coletadas. Do total de mulheres, 29 eram soropositivas para HIV, 55 soronegativas, 45 e 39 estavam grávidas e não-grávidas, respectivamente. MÉTODOS: Amostras fecais foram coletadas de cada mulher uma vez a cada dois meses pelo período de Julho-2006 a Junho-2007, foram triadas para rotavírus pela metodologia de eletroforese em gel de poliacrilamida (EGPA) e através de ensaio imunoenzimático (EIE), para calicivírus e astrovírus por RT-PCR e por EIE para adenovírus. Os astrovírus foram genotipados por Nested-PCR. RESULTADOS: De 84 pacientes, 19 (22,6%) foram positivas para calicivírus (14/19) ou astrovírus (6/19), sendo que uma mulher foi positiva para ambos os vírus em amostras fecais coletadas em diferentes ocasiões. A maioria das amostras positivas foi coletada no período de Julho a Agosto (astrovírus) e de Setembro a Outubro (calicivírus). Nenhuma das amostras analisadas foi positiva para rotavírus ou adenovírus. Os vírus gastroentéricos foram detectados em 13/19 (68,4%) mulheres grávidas, as quais eram HIV-soropositivas ou não. CONCLUSÕES: Os resultados do presente estudo mostram que nem o estado gravídico das mulheres nem a soropositividade para HIV aumentaram o risco para a infecção por nenhum dos vírus gastroentéricos estudados. Este estudo apresenta dados sobre a detecção de vírus gastroentéricos entre mulheres grávidas e/ou HIV-positivas

Epidemiological features of rotavirus infection in Goiânia, Goiás, Brazil, from 1986 to 2000

A total of 2,605 faecal specimens from children up to 10 years old with or without diarrhoea were collected. Samples were obtained from 1986 to 2000 in hospitals, outpatient clinics and day-care centers in Goiânia, Goiás. Two methodologies for viral detection were utilized: a combined enzyme immunoassay for rotavirus and adenovirus and polyacrylamide gel electrophoresis. Results showed 374 (14.4%) faecal specimens positive for Rotavirus A, most of them collected from hospitalized children. A significant detection rate of rotavirus during the period from April to August, dry season in Goiânia, and different frequencies of viral detection throughout the years of study were also observed. Rotavirus was significantly related to hospitalization and to diarrhoeal illness in children up to 24 months old. This study reinforces the importance of rotavirus as a cause of diarrhoea in children and may be important in regards to the implementation of rotavirus vaccination strategies in our country