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By Benson Michael
During the rainy season of 2019, as cholera outbreaks swept through communities from Kano to Bayelsa, Nigeria’s public health response was largely reactive. Field teams deployed quickly with water and antibiotics. But behind the scenes, a more lasting change was taking shape.
In a PCR lab at the National Biotechnology Development Agency (NABDA), molecular scientist Chiamaka Francisca Igweonu was working on a new way to detect cholera early.
She had begun developing a polymerase chain reaction (PCR) test that could identify the presence of Vibrio cholerae from stool samples more quickly and more reliably than traditional methods.
It was not the first attempt to bring molecular tools into Nigeria’s cholera response, but this one stuck.
The PCR method validated by Igweonu was shown to be significantly more sensitive, particularly in early-phase infections, when symptoms were just starting and could return results within hours instead of days. The difference in response time, according to several public health officials, helped contain the spread of the disease in several affected zones.
Dr. Nasir Uthman, a regional health director in Kaduna State, credits the shift in part to Igweonu’s broader approach. “She didn’t just create a test,” he said. “She built a structure that allowed people to use it reliably, across different regions.”
She trained technicians in five zonal public health labs, demonstrating not only how to perform the test but also how to store samples, calibrate equipment, and interpret results in the context of local outbreaks. She also helped design SOPs and checklists to ensure consistency across labs.
Those labs were operational when cholera cases spiked later that year. The result was real-time data flowing from field labs into NCDC’s national surveillance system data that allowed emergency response teams to move faster and with more precision than in previous years.
Chiamaka’s involvement went beyond diagnostics. She worked on integrating molecular testing results into Nigeria’s digital outbreak mapping systems, helping the NCDC visualize which communities were most affected in real time. It was one of the first times that molecular data, rather than just case reports, helped inform the allocation of resources.
Later that year, she was invited to share the project at a WHO regional working group meeting in Dakar. Representatives from other West African countries asked about her workflow, her cold chain solutions, and the training model used to scale it across Nigeria. It was a rare chance to export a homegrown public health innovation; something not often associated with cholera diagnostics in sub-Saharan Africa.
While the PCR framework she helped design has since been adopted in Nigeria’s national cholera response plan, Chiamaka is not one to talk about legacies. “I just wanted the labs to be able to trust their results,” she said.
Her colleagues describe her as careful, deliberate, and systems-oriented. She focused on making things work without shortcuts.
She emphasized the importance of stable supply chains and trained lab personnel not only on equipment but also on why minor errors, such as improperly labeling tubes, could lead to dangerous consequences in outbreak settings.
NABDA has since expanded the approach to other diseases, including yellow fever, using similar diagnostic models. In a field often influenced by external partners, what stood out about this work was that it was developed, led, and implemented by Nigerian scientists.
For all her accomplishments, Igweonu prefers to work quietly. She has continued her career in molecular research and public health, but those who worked with her during that pivotal year say the systems she helped build have lasted. They’re still in use today, still helping public health workers respond to outbreaks with greater confidence.
“She never needed a spotlight,” said one colleague. “She just wanted science to hold up when it mattered.”
And for the communities depending on clean data and fast action, that made all the difference.
