Nurses collect the data of people about to get tested for COVID-19 at a testing center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

Rwandan professor of human genetics and a member of the government's COVID-19 task force, Leon Mutesa, explains the pooled testing procedures for the coronavirus as he speaks to The Associated Press at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

Ruth Irumva, right, is tested for COVID-19 at a testing center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

Medical personnel work testing patient samples for COVID-19 at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

Rwandan professor of human genetics and a member of the government's COVID-19 task force, Leon Mutesa, speaks to The Associated Press at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

A member of medical personnel works testing patient samples for COVID-19 at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

A nurse tests Ruth Irumva for COVID-19 at a testing center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

A member of medical personnel works testing patient samples for COVID-19 at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

Patient samples to be tested for COVID-19 are seen at the Rwanda Biomedical Center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)

People queue to get tested for COVID-19 at a testing center in the capital Kigali, Rwanda, Tuesday, July 28, 2020. Like many countries, Rwanda is finding it impossible to test each of its citizens for the coronavirus amid shortages of supplies but researchers there have created an innovative approach using an algorithm to refine the process of pooled testing that's drawing attention beyond the African continent. (AP Photo)