NIGERIA expects to take delivery of 29 million doses of Johnson & Johnson COVID-19 vaccine in August, allowing it to ramp up its vaccination programme just as a third wave of infections takes hold, the health minister said. Africa's most populous country has recorded close to 171,000 cases of the virus and 2,132 deaths since the start of the pandemic, according to official data, although the real figures are likely to be much higher as testing is patchy. The government had announced in March it was hoping to secure 70 million doses of Johnson and Johnson vaccine this year through…