Figure 3: Streptococcus pneumoniae viability was abated by FeNPs- PEG-eri better than eri. The viability was determinated using concentrations according to CLSI 0.015, 0.03, 0.06, 0.12, 0.25 and 128 μg/mL. Bars with squares (black and withe; erythromycin, empty bars; FeNPs-PEG-eri, filled bars; FeNPs-PEG and grey bars; untreated.