The Johnson & Johnson (Janssen) vaccine uses a slightly different approach than the previous two COVID-19 (Pfizer and Moderna) vaccines.

What does efficacy even mean? Is it the same thing as effectiveness? (Spoiler: Not quite.) Also in this article, compare efficacy rates for the three authorized COVID-19 vaccines.

If you’re still sick weeks after an initial COVID-19 infection, you’re not alone. “Post-COVID” is affecting many COVID-19 survivors. Find out common post-COVID symptoms and how to tell if you’re contagious.

Do the two vaccine injections have to be perfectly timed apart?

If you’re fully vaccinated, travel is much safer – although not without some risk. Get timely advice on both domestic and international travel from infectious diseases expert Richard Starlin, MD.

Read the story of lung transplant recipient, Jake Immink, who has been hospitalized since November 2020.

Get access to a SXSW session recap, featuring our very own James Linder, MD.

Cardiologist Ward Chambers, MD, talks about what it was like to live through not one pandemic, but two.

What happens if you get the first vaccine, then get COVID-19 – testing positive – what about the second shot?

Cough, cough, sneeze, sniffle. If you have allergies, you know the routine. But with COVID-19 symptoms also being very similar, you're probably wondering how to distinguish between the two. One of our allergy specialists discusses the differences and when to seek medical advice.