Abstract:
Clindamycin is one of the important alternative antibiotics in the
therapy of Staphylococcus aureus, particularly in methicillin-resistant S. aureus
(MRSA) infections. Inducible clindamycin resistance (iMLSB - inducible Macrolide-
Lincosamide-Streptogramin B resistance) is a critical factor in antimicrobial
susceptibility testing. Aims: To know the rate of inducible clindamycin resistance
among clinical isolates of Staphylococcus aureus in our hospital by Disk
approximation test (D-test) using the average recommended inter-disk distance
and comparing the results with that of D-test using the lower limit of recommended
inter-disk distance. Materials and Methods: A total of 51 erythromycin-
resistant and clindamycin-susceptible S. aureus isolates were subjected to
disk approximation testing with 21 ± 1 mm and 15 mm edge-to-edge distance
between the clindamycin and erythromycin disks. Statistical Methods: Z-test
levels. Results: Among 51 erythromycin-resistant and clindamycin-susceptible
S. aureus isolates, 25 (49%) were recorded as inducible clindamycin resistant
by D-test with 21 ± 1 mm edge-to-edge distance between the clindamycin and
erythromycin disks. When we re-tested all the 51 strains by D-test with 15 mm
inter-disk distance, we identified 14% more iMLSB strains previously reported as
D-test negative. Z-test for MRSA indicates that 15 mm edge-to-edge distance
has significant advantage. Conclusions: Since the incidence of inducible
clindamycin resistance is high (63% in our study), accurate identification of
inducible clindamycin resistance is important to prevent therapeutic failure in
infections caused by these strains. We suggest the use of D-test with 15 mm
edge-to-edge inter-disk distance for detecting iMLSB.
