After a year of turmoil, cancer researchers see promising signs for mRNA vaccines

By Caleb Hellerman (CNN) — Vita Sara Blechner’s life changed on a Saturday afternoon. The middle school librarian was home in Oceanside, New York, when she felt shooting pains in her back. After an acid reflux pill couldn’t soothe the fiery feeling, her husband suggested a trip to the emergency room. It was March 7,