A bid-ask spread represents the difference between the highest price a buyer is willing to pay for a security (the bid) and the lowest price that a seller is willing to sell the security (the ask).

The Centers for Disease Control and Prevention (CDC) on Wednesday expanded its definition of “close contact” of someone with coronavirus, now saying that multiple brief encounters can also lead to ...

LONDON – The World Health Organisation (WHO) and around 500 experts have agreed for the first time what it means for a disease to spread through the air, in a bid to avoid the confusion early in the ...