Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease.
A total of 179 individuals with acute Chagas disease mainly transmitted by oral source, from Pará and Amapá State, Amazonian, Brazil were included during the period from 1988 to 2005. Blood samples were used to survey peripheral blood for T. cruzi hemoparasites by quantitative buffy coat (QBC), indi...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2013-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3664625?pdf=render |
| _version_ | 1818042051318513664 |
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| author | Ana Yecê das Neves Pinto Vera da Costa Valente José Rodrigues Coura Sebastião Aldo da Silva Valente Angela Cristina Veríssimo Junqueira Laura Cristina Santos Alberto Gomes Ferreira Roberto Cavalleiro de Macedo |
| author_facet | Ana Yecê das Neves Pinto Vera da Costa Valente José Rodrigues Coura Sebastião Aldo da Silva Valente Angela Cristina Veríssimo Junqueira Laura Cristina Santos Alberto Gomes Ferreira Roberto Cavalleiro de Macedo |
| author_sort | Ana Yecê das Neves Pinto |
| collection | DOAJ |
| description | A total of 179 individuals with acute Chagas disease mainly transmitted by oral source, from Pará and Amapá State, Amazonian, Brazil were included during the period from 1988 to 2005. Blood samples were used to survey peripheral blood for T. cruzi hemoparasites by quantitative buffy coat (QBC), indirect xenodiagnosis, blood culture and serology to detection of total IgM and anti-T. cruzi IgG antibodies by indirect immunofluorescence assay (IFA) and indirect hemagglutination assay (HA). All assays were performed pre-treatment (0 days) and repeated 35 (±7) and 68 (±6) days after the initiation of treatment with benznidazol and every 6 months while remained seropositive. The endpoint of collection was performed in 2005. Total medium period of follow-up per person was 5.6 years. Also, a blood sample was collected from 72 randomly chosen treated patients to perform polimerase chain reaction (PCR) method. Proportions of subjects with negative or positive serology according to the number of years after treatment were compared. In the endpoint of follow-up we found 47 patients (26.7%) serologically negative, therefore considered cured and 5 (2.7%) exhibited mild cardiac Chagas disease. Other 132 patients had persistent positive serologic tests. The PCR carried out in 72 individuals was positive in 9.8%. Added, there was evidence of therapeutic failure immediately following treatment, as demonstrated by xenodiagnosis and blood culture methods in 2.3% and 3.5% of cases, respectively. There was a strong evidence of antibody clearing in the fourth year after treatment and continuous decrease of antibody titers. Authors suggest that control programs should apply operational researches with new drug interventions four years after the acute phase for those treated patients with persistently positive serology. |
| first_indexed | 2024-12-10T08:40:10Z |
| format | Article |
| id | doaj.art-baf177738f17453d91a4ebbcee3c1132 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-10T08:40:10Z |
| publishDate | 2013-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-baf177738f17453d91a4ebbcee3c11322022-12-22T01:55:52ZengPublic Library of Science (PLoS)PLoS ONE1932-62032013-01-0185e6445010.1371/journal.pone.0064450Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease.Ana Yecê das Neves PintoVera da Costa ValenteJosé Rodrigues CouraSebastião Aldo da Silva ValenteAngela Cristina Veríssimo JunqueiraLaura Cristina SantosAlberto Gomes FerreiraRoberto Cavalleiro de MacedoA total of 179 individuals with acute Chagas disease mainly transmitted by oral source, from Pará and Amapá State, Amazonian, Brazil were included during the period from 1988 to 2005. Blood samples were used to survey peripheral blood for T. cruzi hemoparasites by quantitative buffy coat (QBC), indirect xenodiagnosis, blood culture and serology to detection of total IgM and anti-T. cruzi IgG antibodies by indirect immunofluorescence assay (IFA) and indirect hemagglutination assay (HA). All assays were performed pre-treatment (0 days) and repeated 35 (±7) and 68 (±6) days after the initiation of treatment with benznidazol and every 6 months while remained seropositive. The endpoint of collection was performed in 2005. Total medium period of follow-up per person was 5.6 years. Also, a blood sample was collected from 72 randomly chosen treated patients to perform polimerase chain reaction (PCR) method. Proportions of subjects with negative or positive serology according to the number of years after treatment were compared. In the endpoint of follow-up we found 47 patients (26.7%) serologically negative, therefore considered cured and 5 (2.7%) exhibited mild cardiac Chagas disease. Other 132 patients had persistent positive serologic tests. The PCR carried out in 72 individuals was positive in 9.8%. Added, there was evidence of therapeutic failure immediately following treatment, as demonstrated by xenodiagnosis and blood culture methods in 2.3% and 3.5% of cases, respectively. There was a strong evidence of antibody clearing in the fourth year after treatment and continuous decrease of antibody titers. Authors suggest that control programs should apply operational researches with new drug interventions four years after the acute phase for those treated patients with persistently positive serology.http://europepmc.org/articles/PMC3664625?pdf=render |
| spellingShingle | Ana Yecê das Neves Pinto Vera da Costa Valente José Rodrigues Coura Sebastião Aldo da Silva Valente Angela Cristina Veríssimo Junqueira Laura Cristina Santos Alberto Gomes Ferreira Roberto Cavalleiro de Macedo Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. PLoS ONE |
| title | Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. |
| title_full | Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. |
| title_fullStr | Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. |
| title_full_unstemmed | Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. |
| title_short | Clinical follow-up of responses to treatment with benznidazol in Amazon: a cohort study of acute Chagas disease. |
| title_sort | clinical follow up of responses to treatment with benznidazol in amazon a cohort study of acute chagas disease |
| url | http://europepmc.org/articles/PMC3664625?pdf=render |
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