As cases in Africa pass one million, Nigeria has tested less than 1% of its population. Here's why.

A patient takes a coronavirus test at a hospital in Nigeria. Some people are treating the virus at home in Africa because of difficulties getting tested and treated.

Lagos, Nigeria (CNN)More than one million people in Africa have been infected with the novel coronavirus but health experts say the numbers do not give a "full picture" of the outbreak on the continent.

As of early Friday morning, Africa had recorded a total of 1,008,154 cases, and more than half of these are in South Africa.
Dr. Matshidiso Moeti, of the World Health Organization, said the cases are a small fraction of the global count but low testing in many African countries means infections have been under-reported.
    The health agency said while testing facilities have increased in some countries compared to when the outbreak began in February, Africa still fell behind the global benchmark.
    In Tanzania, the government claims it has defeated coronavirus and has not released any official data since May, and in Nigeria, the WHO is concerned that testing is not available at the grassroots level.
    "The challenge is how to decentralize these tests available in states and in countries like Nigeria where we need to get to people in the local governments," the agency's program manager for emergency response for Africa, Dr. Michel Yao told CNN.

    Long test result turnaround time

    Nigeria, the African nation with the largest population, has tested less than one percent of its 200 million inhabitants as of Friday, and some in the country say getting a coronavirus test can be challenge.
    While testing is free in state-owned laboratories, there are few of these facilities and they are in major cities. And sometimes, health officials have had to transfer samples to other states to confirm results due to a shortage of kits.
    The state of Lagos is the epicenter of the virus in Nigeria, with 15,580 cases. It has recently closed health centers specifically created to treat Covid patients.
    On Monday, the state's governor, Babajide Sanwo-Olu, announced that worship centers can accommodate half their capacity during services and restaurants are back in business, citing a steady decline in cases.
    There are concerns that people there are self-managing their symptoms at home. Lagos has tested 66,431 samples so far, a fraction of its 20 million residents.
    One resident told CNN he waited for two weeks to get a test at a government laboratory after he fell ill in June.
    "I was going there many times, and it was not until my daughter made many calls, and I ran into a doctor friend who was at the hospital that day that I was able to do the test," Segun Bello-Osagie said.
    Scientists at the African Centre of Excellence for Genomics of Infectious Diseases in Nigeria  analyse COVID-19 samples.