In late 2019, health officials noticed a new disease spreading in Wuhan, China. They named it COVID-19.

Within a few months, it became a pandemic that dramatically changed life for nearly everyone on Earth. Millions of people became sick, and hundreds of thousands died. Leaders ordered whole states and countries to stay home to slow the disease's spread. Companies closed or went out of business. Meanwhile, health-care workers on the front lines saved lives and raced to find treatments. In the Core Library Guide to COVID-19, readers will learn about the disease, how it spread across the globe, and the ways it has changed society.

Health-care workers were on the front lines during the COVID-19 pandemic, saving lives and searching for effective treatments. Other workers, such as grocery clerks and delivery people, also found themselves on the front lines as the rest of society stayed home as much as possible to slow the disease's spread. Front-Line Heroes examines these and other people who faced danger as they continued working to keep the rest of society safe. Features include a glossary, references, websites, source notes, and an index.