
Increasing penicillin and trimethoprim–sulfamethoxazole resistance in nasopharyngeal Streptococcus pneumoniae isolates from Guatemalan children, 2001–2006
Keywords: مقاومت به آنتی بیوتیک; Antibiotic resistance; Erythromycin; Cefotaxime; Macrolide; Cephalosporin; Risk factors