Jm. Ossewaarde et al., DETECTION OF AMPLIFIED CHLAMYDIA-TRACHOMATIS DNA USING A MICROTITER PLATE-BASED ENZYME-IMMUNOASSAY, European journal of clinical microbiology & infectious diseases, 13(9), 1994, pp. 732-740
A microtiter plate-based method to detect amplified DNA was developed.
The method uses one biotin-labeled primer in the polymerase chain rea
ction (PCR) mixture. The labeled amplicon is bound to streptavidin-coa
ted microtiter plates, denatured and hybridized to a digoxigenin-label
ed probe. The specificity of the hybridization reaction was optimized
by varying the temperature of the subsequent washing step and adding u
rea to the washing buffer. The digoxigenin label was detected using an
enzyme immunoassay (EIA). This PCR-EIA was compared with a standard P
CR assay that uses gel electrophoresis, blotting and hybridization to
detect the amplicon, with isolation in cell culture, and with an antig
en detection EIA (Chlamydiazyme) in the diagnosis of Chlamydia trachom
atis infection in 309 female patients attending a sexually transmitted
diseases outpatient clinic. The prevalence of Chlamydia trachomatis i
nfection as determined by isolation in cell culture, EIA, PCR-EIA and
standard PCR assay was 9.1 %, 8.7 %, 12.3 %, and 12.9 %, respectively.
Compared with results of a reference set of confirmed-positive cases
(defined by a positive result in two or more independent assays after
analysis of discrepancies), the sensitivity and specificity was 71.1 %
and 99.6 % for cell culture, 65.8 % and 99.3 % for the EIA, 92.1 % an
d 98.9 % for the PCR-EIA, and 97.4 % and 98.9 % for the standard PCR a
ssay. It is concluded that the PCR-EIA described is a fast, sensitive
and specific method for detecting Chlamydia trachomatis in clinical sp
ecimens.