As antimicrobial resistance continues to threaten global health, a Nigerian microbiologist, Bridget Ugochi Anyanwueze, has developed an improved laboratory method that could advance the discovery and evaluation of new antimicrobial compounds.
The method research was published on June 27, 2026, in the IPS Journal of Applied Microbiology and Biotechnology, with her affiliation listed as the Department of Biology at Southeast Missouri State University, Cape Girardeau, United States, ValidViewNetwork reports.
THE RESEARCH
Anyanwueze’s sole-authored paper, “An Improved in vitro Method for Quantifying the Kinetics of Bacterial Inhibition-Zone Development,” addresses a limitation of the traditional Kirby-Bauer disc diffusion assay, a standard laboratory method used to assess bacterial susceptibility to antibiotics .
Traditionally, the method measures the diameter of the clear zone surrounding an antibiotic disc after a specified incubation period.
While this provides important information about bacterial susceptibility, it does not describe how the inhibition zone develops during the preceding hours.
Anyanwueze investigated whether repeated measurements could provide additional information about the progression of bacterial inhibition.
Using Staphylococcus epidermidis as the test organism, she examined inhibition-zone development following exposure to ampicillin, erythromycin, and neomycin. Measurements were collected at 4, 8, 12, 16, 20, and 25 hours of incubation .
THE FINDINGS
The findings revealed that the antibiotics exhibited different patterns of inhibition-zone development.
Ampicillin produced the greatest absolute increase in inhibition-zone diameter, expanding by 10.23 millimetres, while erythromycin demonstrated the highest percentage expansion at 137.9%.
The study also found that inhibition zones generally expanded more rapidly during earlier observations before slowing at later incubation intervals .
“These differences demonstrate that final inhibition-zone diameters do not capture every aspect of how inhibition zones develop. By incorporating repeated measurements, the improved approach provides additional quantitative information about the progression of measurable bacterial growth inhibition,” Anyanwueze explained .
The findings were supported by statistical analysis that identified significant effects of antibiotic type, incubation time, and their interaction .
THE BROADER WORK
Beyond its methodological contribution, the research connects with Anyanwueze’s broader scientific interest in discovering antimicrobial agents from medicinal plants.
Her previous investigations involving Azadirachta indica (Neem), Moringa oleifera, and Jatropha tanjorensis examined the antimicrobial properties of plant extracts against selected microorganisms .
“With further validation, my method could be applied to investigate how inhibition zones develop following exposure to plant-derived antimicrobial compounds. By comparing these patterns with those of established antibiotics, researchers may obtain additional information to support the characterization of potential antimicrobial candidates,” she said .
WHY IT MATTERS
Antimicrobial resistance is one of the most pressing health threats of the 21st century.
The World Health Organization has warned that without action, drug-resistant infections could cause 10 million deaths annually by 2050.
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Nigeria is particularly vulnerable. Fake and substandard drugs are rampant. Self-medication is common. And the pipeline for new antibiotics is drying up.
Anyanwueze’s research is a small but significant contribution to the global fight. By improving the methods used to evaluate potential antimicrobial compounds, she is helping researchers identify promising candidates more quickly and accurately.
She is also a reminder that Nigerian scientists are making contributions on the global stage.
Her work at Southeast Missouri State University is a testament to the quality of Nigerian scholarship and the potential of the diaspora to contribute to solving global problems.
The method has been developed. The findings have been published. And the fight against antimicrobial resistance has a new weapon. ValidViewNetwork reports.