A clinical trial volunteer participates in Johnson & Johnson's study to test a coronavirus vaccine. Janssen All of the COVID-19 vaccines come with the possibility of side effects. Fewer Johnson & Johnson recipients had reactions compared to people in other vaccine trials. Still, Insider spoke with 5 people who had arm pain, chills, or headaches after the J&J shot. See more stories on Insider's business page. Chloe Kathuria, an 18-year-old college student, wrapped herself in a dozen blankets the night she got the Johnson & Johnson vaccine. "I was freezing," Kathuria told Insider. "For hours I couldn't stop moving because