Vibrio and Raw Shellfish Risk

Vibrio vulnificus is a naturally occurring bacterium in warm coastal water that can cause serious illness through eating raw or undercooked shellfish (most commonly oysters) or through an open cut/wound exposed to seawater. Per CDC: about 150-200 cases are reported nationally each year, and "about one in five people with this infection die — sometimes within 1-2 days of becoming ill."

The Chesapeake Bay region has seen a real, documented increase in Vibrio infections as water temperatures rise — coverage of CDC and regional health data describes a sustained upward trend, with the traditional May-through-October risk season now starting earlier and ending later some years.

Cooking shellfish thoroughly greatly reduces this risk — this is specifically why this guide's own recipes are written fully cooked through, and why raw preparations carry an explicit, prominent warning wherever they appear.