Variants
This paper says that the antibody response from a Pfizer vax to B.1.1.7 and B.1.351 is lower, but the T-cell response is just fine. That means there will be a few more cases in a B.1.1.7- or B.1.351-rich environment, but there won’t be severe cases.
A lot of people are worried about the B.1.617.2 variant, which appears to be even more transmissible than B.1.1.7, maybe 67% more transmissible. Here’s a New York Times article on the concern.
Public Health England (which has been doing a bang-up job at disseminating information, by the way) is tracking a new Variant Of Interest, C.36.3.