Those who are home caregivers for those who are sick. People caring for the sick should wear masks to protect themselves and to prevent further transmission throughout a family unit. Mask wearing has become critical in these situations, thanks to lockdown, said Michael J. Ryan, Chief Executive Director of the WHO Health Emergencies Programme, since most of the new transmissions are happening at the family level. “In some senses,” he said, “the transmission has been taken off the streets and pushed back into the family unit.”