Table 1.

Frequency of inhibition in infection-positive and -negative specimens

COBAS AMPLICOR test and specimenInfection-positive specimensInfection-negative specimens
Total no.No. inhibitory (%)RetestTotal no.No. inhibitory (%)Retest
No. positiveNo. inhibitoryNo. negativeNo. inhibitory
C. trachomatis
 Swab1174 (3.4)1383982a (9.8)2246
 Urine1187 (5.9)6184779b (9.3)689
N. gonorrhoeae
 Swab1151 (0.9)1083163c (7.6)2438
 Urine1188 (6.8)6283670d (8.4)626
M. tuberculosis
 Smear positive1541 (0.6)10290  (0.0)00
 Smear negative1253 (2.4)124,068217  (5.3)96121
HCV1,03661 (5.9)5011929107  (11.5)989
  • a Fourteen of the inhibitoryC. trachomatis swab specimens were not available for retesting.

  • b Two of the inhibitory C. trachomatis urine specimens were not available for retesting.

  • c One of the inhibitory N. gonorrhoeae swab specimens was not available for retesting.

  • d Two of the inhibitory N. gonorrhoeae urine specimens were not available for retesting.