to read the document you can download it by clicking this link: Transmission of SARS-CoV-2, updated 9 July 2020
WHO made the recommendation for people to “avoid crowded places, close-contact settings and confined and enclosed spaces with poor ventilation,” in addition to practices such as wearing fabric masks or face coverings in public places.
In its latest transmission guidance, the WHO acknowledged that some outbreak reports related to indoor crowded spaces have suggested the possibility of aerosol transmissions, such as during choir practice, in restaurants, or in fitness classes.
But the WHO said more research is “urgently needed to investigate such instances and assess their significance for transmission of COVID-19.”
Based on its review of the evidence, the WHO said the coronavirus that causes COVID-19 spreads through contact with contaminated surfaces or close contact with infected people who spread the virus through saliva, respiratory secretions or droplets released when an infected person coughs, sneezes, speaks or sings.
The new guidelines do, however, suggest people should avoid crowds and ensure good ventilation in buildings, in addition to social distancing, and encourage masks when physical distancing is not possible.
To illustrate how the microdroplets can be also a factor for transmission of the disease (COVID-19), you can see the videos made by NHK (Japan News Agency):
Coronavirus: How Opening Windows Can Protect You
Coronavirus: New Facts about Infection Mechanisms
REUTERS: New WHO guidance calls for more evidence on airborne transmission
JakPost: New WHO guidance calls for more evidence on airborne transmission