Zoom shares drop 16% after Pfizer's coronavirus vaccine announcement

Zoom, the popular video conferencing app with nearly 300 million daily users, witnessed a drop in share prices after the pharmaceutical giant, Pfizer announced that its Covid-19 vaccine has proven to be 90% effective in building immunity against the virus. Zoom has been witnessing a massive surge in daily users from 10 million daily users in December, 2019 to 200 million daily users in March, 2020.