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Volume 8, Number 6—June 2002


Geographic Association of Rickettsia felis-Infected Opossums with Human Murine Typhus, Texas

Ardys Boostrom*, Magda S. Beier†, Jackie A. Macaluso†, Kevin R. Macaluso†, Daniel Sprenger*, Jack Hayes‡, Suzan Radulovic†, and Abdu F. Azad†Comments to Author 
Author affiliations: *Corpus Christi-Nueces County Department of Public Health, Corpus Christi, Texas, USA; †University of Maryland School of Medicine, Baltimore, Maryland, USA; ‡University of Texas School of Public Health, San Antonio, Texas, USA;

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Table 2

Seroprevalence of Rickettsia typhi and R. felis in 149 opossums collected in Corpus Christi, Texas, June 1998a

Opossum serum samples Serologic assays
Positive/total (%)
R. typhi R. felis
38/149 (25)
IFAc 10/125 (8) 28/125 (22)

a EIA, enzyme-linked immunoassay (Integrated Diagnostics, Inc., Baltimore, MD); N.D., not done; IFA, indirect immunofluorescence antibody assay.
c IFA with Ctenocephalides felis (FleaData R. felis-infected colony) midgut smears and R. typhi (Wilmington strain) as antigens at >1:128 titer.

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