FELIX ONUAH  NIGERIAN  authorities are disturbed by the low level of coronavirus test sample collections, a senior government official has said. Africa's most populous country of some 200 million inhabitants, as of Thursday had 54,463 confirmed coronavirus cases which have resulted in 1,027 deaths. Boss Mustapha, who chairs the government's task force on the disease, said he and other officials who make up the panel overseeing the response to the pandemic were "disturbed by the low level of sample collection" because of the implications for testing, tracing, and treatment. "Despite the increased diagnostic capacity and improved access to testing, the…