The idea of mixing and matching different COVID-19 vaccines is gaining momentum, with a special focus on letting Johnson & Johnson vaccine recipients get a dose produced by a different company. The J&J shot produces inferior results compared to the vaccines that were created using messenger RNA technology, according to studies and real-world evidence. The main reason to allow heterologous vaccination schedules would be the aim of giving people who got a J&J vaccine to get a boost in protection. “I think what needs to be done—and I believe will be done—is that there will be a degree of flexibility that will be left up to the individual based on their individual situation,” Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said on “Fox News Sunday.” Scientists with Fauci’s agency and other institutions have been studying whether mixing and matching vaccines provokes immune system responses and is …