Erythromycin resistance caused by erm(A) subclass erm(TR) in a Danish invasive pneumococcal isolate: Are erm(A) pneumococcal isolates overlooked?

Erm(A) is rarely reported as erythromycin resistance determinant in pneumococci. One invasive erm(A) isolate was initially tested intermediate erythromycin resistant using E-test. However, upon re-testing it was resistant, thus close to the breakpoint value. This may be a reason why erm(A) only rarely is reported to cause resistance in pneumococci.