Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013.
BACKGROUND: According to official records, dengue was introduced in Brazil in the 80's; since then several epidemics have occurred. Meanwhile, in Rio Grande do Sul (RS, Southern Brazil) the first autochthonous case occurred only in 2007. METHODOLOGY AND PRINCIPAL FINDINGS: In this study we repo...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2014-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4130601?pdf=render |
| _version_ | 1818853690702823424 |
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| author | Gabriela Luchiari Tumioto Tatiana Schäffer Gregianini Bibiana Paula Dambros Beatriz Carneiro Cestari Zenaida Marion Alves Nunes Ana Beatriz Gorini Veiga |
| author_facet | Gabriela Luchiari Tumioto Tatiana Schäffer Gregianini Bibiana Paula Dambros Beatriz Carneiro Cestari Zenaida Marion Alves Nunes Ana Beatriz Gorini Veiga |
| author_sort | Gabriela Luchiari Tumioto |
| collection | DOAJ |
| description | BACKGROUND: According to official records, dengue was introduced in Brazil in the 80's; since then several epidemics have occurred. Meanwhile, in Rio Grande do Sul (RS, Southern Brazil) the first autochthonous case occurred only in 2007. METHODOLOGY AND PRINCIPAL FINDINGS: In this study we report laboratory surveillance of dengue cases and seasonality of positive cases, describe serotypes and characterize the epidemiological pattern of dengue in RS from 2007 to 2013. A total of 9,779 serum samples from patients with suspected dengue fever were collected and submitted to molecular and/or serological analyses for dengue virus identification and serotyping, based on viral isolation, NS1 antigen detection and qRT-PCR, or Dengue IgM capture ELISA and MAC-ELISA. The first autochthonous dengue case in RS was confirmed in 2007 (DENV-3). While in 2008 and 2009 only imported cases were registered, autochthonous infection waves have been occurring since 2010. The highest number of dengue infections occurred in 2010, with DENV-1 and DENV-2 outbreaks in Northwestern RS. In 2011, another DENV-1 and DENV-2 outbreak occurred in the Northwestern region; moreover, DENV-4 was detected in travelers. In 2012, DENV-1 and DENV-4 co-circulated. DENV-2 circulation was only detected again in 2013, in high frequency (56.7%), co-circulating with DENV-4 (35%). Most infections occur in adults during summer. Differences in prevalence between genders were observed in 2007 (60% females), 2008 (60.8% males) and 2009 (77.5% males). CONCLUSIONS: According to results of dengue surveillance, there was an increase in the number of dengue cases in RS and of cities infested with Aedes aegypti, possibly as a consequence of introduction of new serotypes and the difficulty of health programs to control the vector. |
| first_indexed | 2024-12-19T07:40:50Z |
| format | Article |
| id | doaj.art-cfdb9e28aaec46c98a5ff2732c2f0fcd |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-19T07:40:50Z |
| publishDate | 2014-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-cfdb9e28aaec46c98a5ff2732c2f0fcd2022-12-21T20:30:28ZengPublic Library of Science (PLoS)PLoS ONE1932-62032014-01-0198e10439410.1371/journal.pone.0104394Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013.Gabriela Luchiari TumiotoTatiana Schäffer GregianiniBibiana Paula DambrosBeatriz Carneiro CestariZenaida Marion Alves NunesAna Beatriz Gorini VeigaBACKGROUND: According to official records, dengue was introduced in Brazil in the 80's; since then several epidemics have occurred. Meanwhile, in Rio Grande do Sul (RS, Southern Brazil) the first autochthonous case occurred only in 2007. METHODOLOGY AND PRINCIPAL FINDINGS: In this study we report laboratory surveillance of dengue cases and seasonality of positive cases, describe serotypes and characterize the epidemiological pattern of dengue in RS from 2007 to 2013. A total of 9,779 serum samples from patients with suspected dengue fever were collected and submitted to molecular and/or serological analyses for dengue virus identification and serotyping, based on viral isolation, NS1 antigen detection and qRT-PCR, or Dengue IgM capture ELISA and MAC-ELISA. The first autochthonous dengue case in RS was confirmed in 2007 (DENV-3). While in 2008 and 2009 only imported cases were registered, autochthonous infection waves have been occurring since 2010. The highest number of dengue infections occurred in 2010, with DENV-1 and DENV-2 outbreaks in Northwestern RS. In 2011, another DENV-1 and DENV-2 outbreak occurred in the Northwestern region; moreover, DENV-4 was detected in travelers. In 2012, DENV-1 and DENV-4 co-circulated. DENV-2 circulation was only detected again in 2013, in high frequency (56.7%), co-circulating with DENV-4 (35%). Most infections occur in adults during summer. Differences in prevalence between genders were observed in 2007 (60% females), 2008 (60.8% males) and 2009 (77.5% males). CONCLUSIONS: According to results of dengue surveillance, there was an increase in the number of dengue cases in RS and of cities infested with Aedes aegypti, possibly as a consequence of introduction of new serotypes and the difficulty of health programs to control the vector.http://europepmc.org/articles/PMC4130601?pdf=render |
| spellingShingle | Gabriela Luchiari Tumioto Tatiana Schäffer Gregianini Bibiana Paula Dambros Beatriz Carneiro Cestari Zenaida Marion Alves Nunes Ana Beatriz Gorini Veiga Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. PLoS ONE |
| title | Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. |
| title_full | Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. |
| title_fullStr | Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. |
| title_full_unstemmed | Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. |
| title_short | Laboratory surveillance of dengue in Rio Grande do Sul, Brazil, from 2007 to 2013. |
| title_sort | laboratory surveillance of dengue in rio grande do sul brazil from 2007 to 2013 |
| url | http://europepmc.org/articles/PMC4130601?pdf=render |
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