Table 1.

Results of four weekly challenges with MRSA F1836, showing on each challenge rising bacterial counts in the control catheter and no growth from the antimicrobial catheters

	Day 1	Day 2	Day 3	Day 6	Day 7
Day 0, challenge 1
control	3.6 × 104	3.9 × 105	7.5 × 106	4.8 × 107	4.8 × 108
test 1	0	0	0	0	0
test 2	0	0	0	0	0
test 3	0	0	0	0	0
Day 0, challenge 2
control	2.8 × 104	7.5 × 106	1.5 × 107	4.5 × 107	1.1 × 108
test 1	0	0	0	0	0
test 2	0	0	0	0	0
test 3	0	0	0	0	0
Day 0, challenge 3
control	3.9 × 105	3.6 × 106	2.5 × 107	2.1 × 107	1.0 × 108
test 1	0	0	0	0	0
test 2	0	0	0	0	0
test 3	0	0	0	0	0
Day 0, challenge 4
control	2.5 × 105	6.5 × 106	6.6 × 107	2.5 × 108	1.1 × 108
test 1	0	0	0	0	0
test 2	0	0	0	0	0
test 3	0	0	0	0	0

A value of 0 corresponds to a value that was below the lower limit of detection.

The negative cultures remained in the antimicrobial catheters throughout the four weekly challenges and each post-challenge perfusion (7 days).