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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Enzyme immunoassay of antibody to Rochalimaea quintana: diagnosis of trench fever and serologic cross-reactions among other rickettsiae.

Enzyme immunoassay (EIA) tests were used to diagnose trench fever and to determine cross-reactions of Rochalimaea quintana with other rickettsiae. The results were compared with those obtained by counterimmunoelectrophoresis (CIE). All sera from cases of primary or relapsed forms of trench fever were positive both in EIA, with serum antibody titers of 1:20-1:640, and in CIE, giving one to three precipitin lines. Sera from patients with other rickettsial infections were also tested for reactivity with R. quintana antigen: typhus group (Rickettsia prowazekii, Ricketsia mooseri), 15 sera; spotted fever group (Ricketsia ricketsii, Rickettsia akari), eight sera; and scrub typhus (Rickettsia tsutsugamushi), six sera. Strong reactions occurred with four sera from patients with scrub typhus, giving one or two lines in CIE and EIA titers of 1:40-1:160; these results were extended to guinea pig antisera to R. tsutsugamushi. About 50% of typhus group sera reacted with a single line in CIE and had antibody titers of 1:20-1:80 by EIA. The results show that EIA is accurate for the diagnosis of trench fever and, with the results obtained by CIE, suggest that R. quintana is antigenically related to R. tsutsugamushi and possibly to rickettsiae in the typhus group as well.[1]


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