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Characterization of an F1 deletion mutant of Yersinia pestis CO92, pathogenic role of F1 antigen in bubonic and pneumonic plague, and evaluation of sensitivity and specificity of F1 antigen capture-based dipsticks.

Abstract：

:We evaluated two commercial F1 antigen capture-based immunochromatographic dipsticks, Yersinia Pestis (F1) Smart II and Plague BioThreat Alert test strips, in detecting plague bacilli by using whole-blood samples from mice experimentally infected with Yersinia pestis CO92. To assess the specificities of these dipsticks, an in-frame F1-deficient mutant of CO92 (Δcaf) was generated by homologous recombination and used as a negative control. Based on genetic, antigenic/immunologic, and electron microscopic analyses, the Δcaf mutant was devoid of a capsule. The growth rate of the Δcaf mutant generally was similar to that of the wild-type (WT) bacterium at both 26 and 37 °C, although the mutant's growth dropped slightly during the late phase at 37 °C. The Δcaf mutant was as virulent as WT CO92 in the pneumonic plague mouse model; however, it was attenuated in developing bubonic plague. Both dipsticks had similar sensitivities, requiring a minimum of 0.5 μg/ml of purified F1 antigen or 1 × 10(5) to 5 × 10(5) CFU/ml of WT CO92 for positive results, while the blood samples were negative for up to 1 × 10(8) CFU/ml of the Δcaf mutant. Our studies demonstrated the diagnostic potential of two plague dipsticks in detecting capsular-positive strains of Y. pestis in bubonic and pneumonic plague.

journal_name

J Clin Microbiol

journal_title

Journal of clinical microbiology

authors

Sha J,Endsley JJ,Kirtley ML,Foltz SM,Huante MB,Erova TE,Kozlova EV,Popov VL,Yeager LA,Zudina IV,Motin VL,Peterson JW,DeBord KL,Chopra AK

doi

10.1128/JCM.00064-11

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

1708-15

issue

5

eissn

0095-1137

issn

1098-660X

pii

JCM.00064-11

journal_volume

49

pub_type

杂志文章

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