THOUSANDS of vaccinators fanned through villages and towns across 73 districts in Ghana, immunizing more than 4.6 million children against vaccine-derived poliovirus. Mass immunization campaigns, like many key health services, have suffered a heavy jolt dealt by the COVID-19 pandemic. Health authorities in Ghana are now reviving and reinforcing essential services to not only better withstand disruption in case of a new COVID-19 wave but also improve quality. The latest rounds of polio vaccinations carried out in October had been scheduled for April and May but were shelved in the face of rising COVID-19 cases that overstretched the health system,…