Hannah Frances Davidson travelled north from Matopo Mission in Southern Rhodesia, present-day Zimbabwe, and arrived in 1906 with two African helpers and another American missionary, Adda Engle. She was sent by the Brethren in Christ, a small Anabaptist denomination with roots in Pennsylvania. Her goal was explicitly religious: to convert Tonga and Ila people to Christianity. Whatever one makes of that objective, the means she used were the ones most missions of her era offered: a school, a church, and eventually a clinic. Tonga and Ila families who engaged with Macha did so for their own reasons. Some converted. Some sent children for education while maintaining traditional practices at home. Some took the medical help and kept a polite distance from the theology. The mission took root in part because the people it served decided what they would accept from it, and on what terms. That pattern, in which the community reshapes the mission as much as the mission shapes the community, has held at Macha for more than a century.

In the 1950s, Alvan Thuma, a Brethren in Christ physician from the United States, and his wife Ardys came to Macha. Under their work the clinic grew into a hospital with real surgical capacity. Their lives at Macha were documented later in the book First a Friend, a title that captures something about how the Thumas worked: treating patients as neighbours first, whatever else the encounter was. The mission expanded across southern Zambia during the same decades, anchoring new work at Sikalongo and Choma. The Brethren in Christ church in Zambia, now largely led by Zambians, traces many of its congregations back to this cluster of mission stations. What the first missionaries planted in 1906 has long since become a Zambian institution.

In 2003 the Malaria Institute at Macha (MIAM) was formally established, building on decades of disease surveillance at the hospital. The institute partnered with the Johns Hopkins Bloomberg School of Public Health, and has since conducted some of Africa's most consistent longitudinal work on malaria transmission, drug efficacy, and the genetic diversity of the Plasmodium parasites that cause the disease. The research has expanded to include tuberculosis and HIV, with particular attention to pediatric HIV. Macha's advantage as a research site is the one thing that also made it hard to reach as a mission: its rural setting, in a community stable enough over generations for the same households to be followed across years of data collection. The collaboration has produced graduate students, published papers, and, as importantly, trained Zambian researchers and clinicians now leading similar work elsewhere. Vision Community Radio, broadcasting from a station just off the mission grounds, carries public health information on 92.9 FM within an 80-kilometre radius.

Around the mission a cooperative organisation called Macha Works has added layers of practical infrastructure: an aerodrome, a library, a craft shop, a restaurant, ICT training, a Christian school, and housing at what it calls Ubuntu Campus. A Jatropha farm once explored biofuel as a potential local industry. From Macha, the group extended its activities to eight other rural communities across Zambia by 2010. What makes this scale interesting is how grounded it is. Macha has remained, throughout, a place where the church and the hospital and the school and the research institute share the same footpaths, and where local Tonga and Ila families have been the consistent majority of staff, students, and patients. The community that predated the mission in 1906 has outlasted every passing generation of foreign workers and shaped every initiative into its own terms. A visitor coming for the first time sees red dirt roads and modest buildings and does not always realise that some of them are among the most consequential rural research facilities on the continent.