I think the first half could have been scrapped or written differently. And the end of the epilogue was awful. 
It felt like Picoult had too many threads she wanted to weave in - so much research that it became too clinical. She's written from medical perspectives before without it feeling this ... Forced? I'm not sure. 

Overall, didn't love it.
I know it will take us a while to unravel everything in this pandemic, but I wonder if this was written too soon.