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Table 3 Prevalence of co-resistance to penicillin and erythromycin among Streptococcus pneumoniae isolates collected during the PROTEKT US study Years 1–4 according to US region

From: Trends in antibacterial resistance among Streptococcus pneumoniae isolated in the USA: update from PROTEKT US Years 1–4

  Proportion of isolates (n [%])
Region Year 1 Year 2 Year 3 Year 4
North-central 446 (21.2) 385 (17.7) 431 (17.8) 321 (16.1)
Northeast 606 (16.3) 428 (13.5) 471 (13.9) 336 (12.1)
Northwest 55 (13.0) 73 (13.7) 66 (12.1) 42 (9.7)
South-central 381 (26.2) 309 (23.2) 378 (21.9) 204 (15.3)
Southeast 310 (29.2) 309 (22.2) 282 (19.6) 157 (15.3)
Southwest 264 (19.6) 205 (14.5) 152 (11.2) 70 (7.6)
USA total 2,061 (20.4) 1,709 (17.1) 1,780 (16.4) 1,130 (13.3)