I found this link, with difficulty. It is the WHO 2019 recommendations for handling respiratory infections. Masks and lock downs are not much recommended.
https://apps.who.int/iris/bitstream/handle/10665/329438/9789241516839-eng.pdf?sequence=1&isAllowed=yFace masks worn by asymptomatic
people are conditionally
recommended in severe
epidemics or pandemics, to reduce
transmission in the community.
Although there is no evidence
that this is effective in reducing
transmission, there is mechanistic
plausibility for the potential
effectiveness of this measure.
A disposable surgical mask is
recommended to be worn at all
times by symptomatic individuals
when in contact with other
individuals. Although there is no
evidence that this is effective in
reducing transmission, there is
mechanistic plausibility for the
potential effectiveness of this
measure.