According to the WHO, who was initially encouraged to wear masks in March?

The World Health Organization (WHO) initially recommended that only those who were symptomatic and caregivers for individuals with COVID-19 should wear masks in March. This guidance was based on the understanding of how the virus was transmitted at that time, primarily emphasizing the use of masks to protect those in close contact with infected individuals. Those with symptoms were advised to wear masks to help prevent the spread of respiratory droplets, which are a primary mode of transmission for the virus. Caregivers were similarly advised to use masks to protect themselves and other vulnerable individuals.

As the pandemic progressed and more information became available regarding asymptomatic transmission and community spread, recommendations evolved to encourage mask-wearing among the general public. However, the initial focus was very much on protecting the vulnerable population and healthcare settings rather than widespread use among all individuals in public.