Detection of Trypanosoma cruzi in untreated chronic chagasic patients is improved by using three parasitological methods simultaneously.
J Antimicrob Chemother
; 66(10): 2224-6, 2011 Oct.
Article
em En
| MEDLINE
| ID: mdl-21798882
ABSTRACT
OBJECTIVES:
This study compared three parasitological methods applied simultaneously in individuals with untreated chronic Chagas' disease in order to determine their individual and combined performances.METHODS:
From a total of 100 chronic chagasic patients from endemic areas of Chile, with informed consent, we extracted 2 mL of peripheral venous blood for PCR (PCR-B) and applied two xenodiagnosis (XD) boxes with seven uninfected Triatoma infestans nymphs each for microscopic examination and PCR of faecal samples of the triatomines fed on each patient (PCR-XD). The PCR-B and PCR-XD reactions were performed with oligonucleotides 121 and 122, which anneal to the four constant regions of the minicircles of Trypanosoma cruzi kinetoplasts. The 330 bp PCR product was analysed by electrophoresis in a 2% agarose gel and visualized by staining with ethidium bromide.RESULTS:
PCR-B detected T. cruzi in 58% of the cases, while PCR-XD proved to be more sensitive than XD (67% versus 14%, respectively) (Pâ=â0.0001). There was no difference between the detection power of PCR-B and PCR-XD (Pâ=â0.222). The percentage detected as positive was much greater when the three tests were considered (84%) (Pâ=â0.00001).CONCLUSIONS:
The simultaneous application of more than one technique for the parasitological diagnosis of Chagas' disease in untreated individuals increases the possibility of detection of T. cruzi.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
3_ND
Base de dados:
MEDLINE
Assunto principal:
Trypanosoma cruzi
/
Doença de Chagas
Tipo de estudo:
Diagnostic_studies
Limite:
Adolescent
/
Adult
/
Aged
/
Animals
/
Female
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
America do sul
/
Chile
Idioma:
En
Revista:
J Antimicrob Chemother
Ano de publicação:
2011
Tipo de documento:
Article