 Corresponding author: CHIBUISI FRANCIS OGBUKA Copyright © 2024 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0. Ability of Azadirachta indica and Ocimum gratissimum to inhibit the growth of some hospital isolates CHIBUISI FRANCIS OGBUKA 1, * , NGOZI O IZUCHUKWU 2 , OGWO ELISHA UKO 3 , JESSICA EZINNE EKELEME 4 and OGECHI JULIANA OGBODO 5 1 Department of Biological Science {Medical Microbiolgy}, Faculty of Basic and Applied Science, Rhema University Nigeria Aba, Abia State Nigeria. 2 Department of Biological Science, Faculty of Basic and Applied Science, Rhema University Nigeria Aba, Abia State Nigeria. 3 Department of Human Physiology, College of Medical and Health Science, Abia State University Ututru, Nigeria. 4 Department of Biological Science, Faculty of Basic and Applied Science, Rhema University Nigeria Aba, Abia State Nigeria. 5 Department of Public health Science, National Open University, Portharcourt, Nigeria. World Journal of Advanced Research and Reviews, 2024, 22(02), 1410–1414 Publication history: Received on 11 April 2024; revised on 18 May 2024; accepted on 21 May 2024 Article DOI: https://doi.org/10.30574/wjarr.2024.22.2.1566 Abstract The study on the ability of Azadirachta indica and Ocimum gratissimum to inhibit the growth of some hospital isolates was carried out following several reports on the antimicrobial potentials of these plant leaves among locals. Some fresh leaves of Azadirachta indica and Ocimum gratissimum were processed into an aqueous extract as well as an ethanolic extract and preserved at 4 o C. samples of Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Candida albicans which served as test microorganisms were obtained from the Federal Medial Centre Umuahia Abia State Nigeria. Antimicrobial sensitivity test of test isolates was determined using the Kirby-bauer disc diffusion method Disc diffusion method of the extracts . A 0.5 Mc farland solution of the 4 organisms were prepared and inoculated into an already prepared Mueller hinton agar plates containing the paper disc of 400mg/ml aqueous and ethanolic extracts. A control experiment was set up with 2mg/ml gentamycin disc. After 48 hours incubation, Ethanolic extract of Azadirachta indica showed the highest zones of inhibition of 7.5mm on Staphylococcus aureus, followed by ethanolic extract of Ocimum gratissimum 7.0mm on Escherichia coli. While the aqueous extracts of both Azadirachta indica and Ocimum gratissimum showed least zones of inhibition on Candida albicans. The overall were more antibacterial effective than antifungal. Therefore, the Ethanolic extract of Azadirachta indica and Ocimum gratissimum possess more antibacterial effect and less antifungal effect. Keywords: Antimicrobials; Antibiotics; Sensitivity; Isolates; Extracts; Ocimum gratissimum; Azadirachta indica; Mc- Farland Standard; Antibacterial; Antifungal. 1. Introduction With the increasing incidence of diseases caused by bacteria and other microorganisms, as well as the development of drug resistance, there is an urgent need to search for alternatives from plant sources to combat these pathogens. The development of a new antimicrobial drug is difficult, taking into account of poor selective toxicity and fast development of resistant viral variants with the existing drugs. Frequencies of bacterial resistance to antibacterial drugs are increasing (Levy, 2002). The ease of national and international travel means that resistant organisms can be transported easily, making it a global problem. Despite all efforts by health bodies, the threat of bacterial and other infectious diseases persist, making the search for more effective and efficient drugs ever more pressing. For their basic medical needs, four out of five people turn to traditional medicine. Many bioactive chemicals found in medicinal plants can be