IN ITS ‘SCIENTIFIC brief’ released on March 29th, the World Health Organization (WHO) said that Covid-19 can ‘be transmitted through droplets of different sizes: when the droplet particles are <5-10 μm (a micrometre or μm is one-millionth of a metre) in diameter, they are referred to as respiratory droplets, and when they are >5 μm … Continue reading COVID-19: WHO Under Pressure as Evidence Mounts On Aerosol Transmission