Eze, E. I., & Onumah, V. N. (2025). Evaluation of Antibacterial Activity and Interaction of Methanolic Extract of Physcia grisea and Cephalosporin on Clinical Isolates of Streptococcus pyogenes. Journal of Biological Research and Biotechnology, 8(2), 700 – 702. https://doi.org/10.4314/br.v8i2.66894