7 COVID-19 Vaccine Reaction Warning Signs to Look for in People with IDD Share Article It can be difficult to recognize COVID-19 vaccine reactions in people who don’t communicate using words, explains Dr. Craig Escude, from Health Risk Screening. Learning common signs helps protect people with intellectual and developmental disabilities who don’t verbally communicate that something’s wrong. According to the latest information, almost 52 million Americans, or 11.5% of the total U.S. population, have already received the COVID-19 vaccine. Many people with IDD communicate without using words, which can make it challenging to understand how they feel and what’s going on with them. It’s important to learn what signs to watch out for so they can be treated quickly if necessary.