Many thanks @ErinBurnett for hosting us @OutFrontCNN I discussed new info re J&J vaccine vs delta variant in @biorxivpreprint showing sharp declines in virus neutralizing antibodies in those immunized with one dose. However this is in vitro test tube study 
It’s likely the single dose vaccination still protects altogether possibly at lower levels similar to what was seen vs B.1.351 from South Africa. So far I’m not aware of hospitalizations among those who got J&J but it’s possible a 2nd dose might be recommended down the line
Looking at the phase 1 and 2 data from last year, those who received 2 doses of the J&J vaccine had really high levels of virus neutralizing antibodies and I’ve always felt this was better as a 2 dose vaccine. But we’ll see what the company and regulators say
Another possibility is second immunization with mRNA vaccine
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