Why mask is necessary to prevent the corona?

.mask is mandatory

• Because we can’t tell who’s infected in the crowd 

• An effective way to limit transmission . 

• It prevents larger droplets from evaporating into smaller droplets that can travel farther

Do masks protect the people wearing them or the people around them?

• The best benefit is for people who have corona to protect them from giving it to other people,

• An healthy person will also be protected from wearing a mask  

  you could still catch the virus through the membranes in  
  your eyes, a risk that masking does not eliminate.

How many people need to wear masks to reduce community transmission?

• You want 100 percent of people to wear masks, but even 80 percent wear it, we would achieve more than a strict lock down.

• The latest forecast suggests that 33000 deaths could be avoided by October 1 if 95 percent of people wore masks in public.
• .

.Hong kong is doing a good job

It has kept its outbreak relatively under control because a vast majority wear a mask

Even if you live in a community where few people wear masks, you would still reduce your own chances of catching the virus by wearing one, 

You should always wear masks and socially distance,
 . 

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