HAUWA Ibrahim is unsure when she will see her family again. Four months ago, the 29-year-old nurse volunteered to work at a COVID-19 treatment centre in Nigeria’s capital Abuja.  Worried she might put her family at risk of catching the virus, she opted to stay at the centre. Like her, many health workers lending a hand to the country’s battle against the pandemic have forgone time with family. Working up to 12 hours a day when it gets busy, Ibrahim, who opted to volunteer fulltime when Asokoro hospital in Abuja was turned into a COVID-19 treatment centre, says few are…