I had reservations about J&J and AZ because of their complicated nature. I had more confidence in mRNA vaccines (Pfizer and Moderna) as simpler and more elegant

I had reservations about J&J and AZ because of their complicated nature. I had more confidence in mRNA vaccines (Pfizer and Moderna) as simpler and more elegant to produce the desired immune response. Anytime there are extra steps, there's added risks something can go wrong and cause unknown or horrible side-effects.