Whether pre-symptomatic or asymptomatic, people not showing symptoms can spread the virus, which is why wearing masks and keeping distance are important to limiting transmission.
The farthest-along candidates are a viral vector vaccine being tested by the University of Oxford and AstraZeneca, a repurposed vaccine, originally developed in the early 1900s for protection against tuberculosis, and a whole-virus vaccine being tested by the state-owned Chinese company Sinopharm.
Did you know that every two seconds someone in the U.S. needs blood? But, only 3% of age-eligible people donate blood annually. Donating blood is essential to community health and the need for blood is constant. One donation can potentially save up to three lives.