Rapid Diagnosis of Scrub Typhus by a Passive Hemagglutination Assay Using Recombinant 56-kilodalton Polypeptides

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 1993 Aug 1

PMID 8370730

Citations 18

Authors

I S Kim

S Y Seong

S G Woo

M S Choi

J S Kang

W H Chang

Affiliations

Soon will be listed here.

Abstract

The genes encoding the 56-kDa polypeptides were amplified by polymerase chain reaction from the genomic DNAs of three serotypes of Rickettsia tsutsugamushi, Gilliam, Karp, and Boryong. The amplified products were cloned into expression vector pIH821, and the recombinant antigens were expressed in Escherichia coli as fusion proteins with maltose-binding protein. The recombinant 56-kDa polypeptides were purified by affinity chromatography for the sensitization of sheep erythrocytes. The recombinant 56-kDa polypeptides were evaluated with 89 serum specimens from health blood donors, 94 serum specimens from scrub typhus patients, and 31 serum specimens from patients with other febrile diseases by a passive hemagglutination assay (PHA). Among the scrub typhus patients diagnosed by indirect immunofluorescent-antibody testing, the antibodies to R. tsutsugamushi were detected in 93 patients (99%). One serum specimen from a healthy person showed a false-positive reaction by this method. The recombinant PHA showed no cross-reactions with sera obtained from other febrile patients with diseases such as murine typhus, hemorrhagic fever with renal syndrome, and leptospirosis. In conclusion, this recombinant PHA could be substituted for the conventional indirect immunofluorescent-antibody test and the immunoperoxidase test.

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