COVID-19 Breakthrough Case Symptoms: Healthy Woman Gets 'Deathly Ill' From Delta Variant KEY POINTS Doctors initially told her she would only suffer a mild COVID-19 case Nancy Miller continues to suffer lingering COVID-19 symptoms A healthy woman in New Jersey on Thursday revealed she had gotten “deathly ill” from the highly contagious Delta variant despite being fully vaccinated against COVID-19. Nancy Miller, 62, of Port Monmouth, got her second shot of a COVID-19 vaccine developed by Moderna on March 28. However, the New Jersey resident began feeling sick on July 8 three days after she and her family came home from a family reunion in Sarasota, Florida.