More good news!  In addition to last week’s announcement of very high (90%) COVID-19 vaccine efficacy emerging from the first interim analysis of a phase 3 trial [1], we received word that a second vaccine had similar initial efficacy at 94.5%.[2]  Both of these candidates use an mRNA platform, a novel approach to human vaccines.  Th...

Why is herd immunity important? Herd immunity occurs when a large portion of a community (the herd) becomes immune to a disease, making the spread of disease from person to person unlikely. As a result, the whole community becomes protected — not just those who are immune. Often, a percentage of the population mus...

What is herd immunity? When most of a population is immune to an infectious disease, this provides indirect protection—or herd immunity (also called herd protection)—to those who are not immune to the disease.Sponsored content