PRESIDENT Muhammadu Buhari has had his first COVID-19 vaccine shot, part of a bid to boost public confidence as Nigeria attempts to inoculate 80 million people this year. Vaccinating Nigeria's 200 million people, and those in other developing countries, is seen as key to stemming the spread of the coronavirus, but getting doses across the vast nation, with its pot-holed roads and lawless areas, is a huge challenge. Not all Nigeria's states have functioning airports, rail networks are limited, and authorities also have to overcome public distrust around the vaccines. "As a demonstration of leadership and faith in the safety…