At least three aides of the Chief of Staff to President Muhammadu Buhari, Abba Kyari, have reportedly tested positive for the coronavirus.
They have also been hospitalized.
Meanwhile, other aides and staff in the office have been asked self-isolate and seek help if they become symptomatic.
Recall that Kyari tested positive for the virus on Tuesday.
The Nation quoted anonymous presidential sources as saying every person who had direct contact with Mr. Kyari or his sick aides have been advised to self-isolate immediately and get tested.