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1/ Important distinction here is asymptomatic (truly no symptoms throughout the whole course of disease) versus pre symptomatic (no symptoms for the first couple of days in which you still have virus/can still transmit)

#covid19
thehill.com/homenews/coron…
2/ If they are saying that truly asymptomatic cases are not a big contributor to the spread of #covid19, that is likely because very few cases seem to be truly asymptomatic all the way through.

Most end up being presymptomatic.

Will need to see the data behind statement.
3/ Most importantly, our concern has largely been around *presymptomatic* spread— the ~two days before you show symptoms where you are still quite contagious & have rising viral load in upper respiratory tract.

Upshot: wear masks, especially indoors/ face to face.
Looking at this tweet from Dr. Van Kerkhove, it appears that they are likely referring to truly asymptomatic (all the way through, never develop symptoms)— in which case, this is less surprising.

Our focus has been on the concern of presymptomatic spread
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