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. 1989 Jul;27(7):1477–1482. doi: 10.1128/jcm.27.7.1477-1482.1989

Detection of Trypanosoma cruzi by DNA amplification using the polymerase chain reaction.

D R Moser 1, L V Kirchhoff 1, J E Donelson 1
PMCID: PMC267598  PMID: 2504769

Abstract

The polymerase chain reaction was used to amplify a 188-base pair (bp) segment of the repetitive 195-bp nuclear DNA sequence of Trypanosoma cruzi that is the most abundant sequence in this organism. The reaction amplified this repetitive element in four T. cruzi isolates from widely separated geographic regions. No amplification of the 188-bp fragment occurred when DNAs extracted from Leishmania spp., African trypanosomes, or blood samples from mice and humans were used. Amplification of one-half of the DNA from a single T. cruzi parasite produced an amount of the 188-bp element that was readily visible in a gel stained with ethidium bromide. Hybridization of a radiolabeled probe to membrane-bound amplification products increased the sensitivity to a level at which 1/200 of the DNA in a single parasite could be detected. T. cruzi DNA was readily detected in DNA extracted from the abdominal contents of infected insect vectors reared in the laboratory. No parasite DNA was detected in the blood samples of two individuals known to be infected with T. cruzi, possibly because in such patients the number of circulating parasites are extremely low or because parasitemias are intermittent. These results represent a considerable increase in sensitivity over previously reported methods for the detection of T. cruzi infections. Polymerase chain reaction amplification can be used to evaluate large numbers of samples in a single day and thus should be useful in large-scale studies of the prevalence of T. cruzi in both insect vectors and mammalian hosts.

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Selected References

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