Aerosol transmission route for SARS-CoV-2 infections is implicitly recognized by WHO in technical briefing, proposing as precautionary measure to flush toilets with closed lid (fecal-oral transmission via aerosols).

March 1st technical briefing from WHO referenced on page 2 in:

https://www.rehva.eu/fileadmin/user_upload/REHVA_COVID-19_guidance_document_ver2_20200403_1.pdf