Dr. Sanjay Gupta explains the difference between four coronavirus variants the CDC has at one point described as "Variants of Concern."

Dr. Jonathan Reiner, a CNN medical analyst and cardiologist, responded to the latest travel restrictions related to the Omicron coronavirus variant, saying travel bans are "an illusion of protection."

CNN's Chief Medical Correspondent Dr. Sanjay Gupta talks with survivors of Covid-19 and how the virus can damage your body.

CNN's John Berman asks Dr. Anthony Fauci about Covid-19 vaccine boosters for kids and teenagers six months after their second vaccine shot.

Matthew Davidson was one of the more than 100,000 people to die from a drug overdose in the US from May 2020 to April 2021. CNN's Miguel Marquez speaks to his mother on how she works to stop others from joining that statistic.

Dr. Anthony Fauci talks with Jake Tapper about the Omicron variant of Covid-19 and working with health officials in South Africa.

Many families are coming together this holiday season for the first time in a long time. CNN's Dr. Sanjay Gupta shares these tips on how to protect your loved ones from getting Covid-19.

Dr. Peter Hotez discusses the Omicron variant and when we'll know if vaccines are effective against it.

Dr. Francis Collins cautions that people should continue to take every measure they can to prevent the spread of Covid-19 as the world grapples with the emergence of the Omicron variant.

Dr. Anthony Fauci shared that it's possible the Omicron Covid-19 variant is already in the US during an NBC interview.

Dr. Anthony Fauci discusses the discovery of the new Omicron Covid-19 variant that appears to be spreading rapidly in parts of South Africa and what it may mean for the efficacy of the coronavirus vaccines.

CNN's David McKenzie reports on the UK adding six African countries to the "red list" over a new variant South African scientists believe could evade immunity and be more transmissible than previous variants.

World Health Organization Europe director Dr. Hans Kluge says vaccines alone will not be enough to protect the continent from a new wave of coronavirus cases this winter.