Afia Zafar et al. 2022. Increase in Penicillin and multidrug resistance in Streptococcus pneumoniae (1993-2016): report from a tertiary care hospital laboratory, Pakistan. Journal of the Pakistan Medical Association. 71, 12 (Jan. 2022), 2726–2730. DOI:https://doi.org/10.47391/JPMA.1178.