TABLE 1.

Culture versus Ureaplasma parvum PCR and PCR/ESI-MS results

Day	Sample	Gram stain result	Culture result	PCR/ESI-MS result	PCR level (genome equivalents/well)	U. parvum PCR result	CRP level (mg/dl)	Antimicrobial treatment (no. of days of treatment)
−1	Synovial fluid	No organisms seen	No growth	U. parvum	340	Positive	8.27	None
Day of surgery	Synovial fluid	No organisms seen	No growth	U. parvum	366		8.83	Vancomycin (1)
	Articular tissue	No organisms seen	No growth	U. parvum	234			Cefepime (1)
PODa
28	Synovial fluid	No organisms seen	No growth	U. parvum	35	Positive	3.15	Vancomycin (29), ertapenem (24)
48b							3.33	Vancomycin (49), ertapenem (44)
132	Synovial fluid	No organisms seen	No growth	No detection	NAc	Negative	1.97	Doxycycline (84)

^aPOD, postoperative day.

^bOn day 48, antibiotic treatment was changed to oral doxycycline based on the results of the PCR and PCR/ESI-MS testing.

^cNA, not available.