Why a Vaccine Won't Create Instant Immunity

More than a month into a resurgence of the novel coronavirus that has besieged Sun Belt states, flooded hospitals and strained public-health infrastructure, the U.S. still lacks a complete picture of the reality on the ground. That’s because the U.S. doesn’t have ANY real-time sy ...  Show more

In the race to study immunity to the virus, scientists first focused on antibodies -- proteins that stick to and disable foreign invaders. That’s because creating antibodies is the basis for most successful vaccines, so scientists are interested in learning who develops coronavir ...  Show more

The vaccine hopes of millions of people worldwide are hanging on the Pfizer vaccine, but the supply of the shot is facing delays. Why? Well, it relies on a whole lot of things that have never happened before all happening at once, in perfect sequence. It's the first approved mRNA ...  Show more

A vaccine for Covid-19 could come faster than previous vaccines, but it could still be a year or more before one is widely available. CNN's Chief Medical Correspondent Dr. Sanjay Gupta talks to a clinical trial participant and explains why this vaccine search is breaking barriers ...  Show more

Researchers around the world are racing to develop a vaccine against Covid-19, with more than 170 candidate vaccines now in development. Most vaccines take years of testing and additional time to produce at scale, but scientists are hoping to develop a coronavirus vaccine at reco ...  Show more

In a global pandemic, you have to take your successes where you can find them.Among the doom and gloom of three-quarters of a million new cases a day worldwide, it's important to look at how much progress we've made in fighting back against COVID-19.To date, more than a billion v ...  Show more