Mask is a must

             
 
Spread of emission of sneeze cloud 

A video film analysed it

• Largest droplets rapidly settle within 1 -2 meters away from the person
• The smaller and evaporating droplets travel the dimensions of the room and land up to 6 - 8 meters away from the person

     The droplets in aerosols from coughing travel with  
     airspeed of 8 m/sec

Center for Disease Control (CDC) in U.S. observed:

Both symptomatic and asymptomatic transmission are  common. 
viral load peaks  before symptoms begin 

 Just speaking is enough to expel virus-carrying droplets.

Two compelling case reports:

•  A man flew from China to Toronto and then tested positive. He had a dry cough but he wore a mask on the flight, All 25 people closest to him on the flight tested negative  . 

• Two hair stylists in U.S. had close contact with 140 clients while sick with corona.

      Everyone wore a mask and none of the clients tested     

      positive.

A mnemonic is the “Three W’s" 

• wearing a mask,
• washing your hands, 
• watching your distance.

Cleaning your iPhone or wiping down your groceries are “just distractors.” They are not a major source of transmission.

Most important is wearing a mask