This Research Letter says that vaccines do not decrease sperm production. There was actually an increase in sperm production, but that might be due to increased abstinence time before the second sample collection.
This preprint from India says that the Delta strain is more resistant to antibodies in vitro, transmit from health care worker to health care worker, and AZ antibodies don’t work as well in vitro as Pfizer antibodies. (TBF, AZ antibodies don’t work as well in vitro as Pfizer against COVID Classic or Alpha, either.)
This preprint on Long COVID says that there are two distinct clusters of symptoms which show up:
This article talks about how totally Novavax rocks.
This article talks about boosters.
This essay talks about going back to the office, and how maybe it’s not such a great idea.