Adherence to facemask use in public places during the autumn-winter 2020 COVID-19 lockdown in Greece: observational data.

Background: Wearing facemasks is of proven efficacy as a public health protective measure against COVID-19. Currently there are no observational data concerning the wearing of facemasks and the adherence to guidelines concerning their handling.

Methods: Registration of the way passers-by were wearing facemasks at 26 different locations of five major cities in Greece.