A coronavirus app that alerts people if they have recently been in contact with someone testing positive for the virus "could play a critical role" in limiting lockdowns, scientists advising the government have said.
The location-tracking tech would enable a week's worth of manual detective work to be done in an instant, they say.
But the academics say no-one should be forced to enrol - at least initially.
The governor of Lagos state, the economic hub of Nigeria, has announced that all open markets and shops, except for sellers of food, medicines and life-saving equipment, must close for seven days from Thursday.
This is part of measures to prevent the spread of coronavirus in Africa’s most-populous nation, which has 44 confirmed cases of Covid-19.
Governor Babajide Sanwo-Olu also called for magistrate and high courts to close immediate...