Emily Baumgaertner writes in the Los Angeles Times, that a plasma shot can prevent coronavirus infection short term now.
The federal government and pharmaceuticals are cool on this now, apparently for financial reasons.
There would be a good question as to how many doses could be made, and who gets them (health care workers first).
A similar question exists for the BMG vaccine.
The Conversation reports on the idea of one vaccine to handle all coronaviruses, but there could be dangers, like ADE, or unusual microclots.
The CEI of Pfizer says it can have a vaccine ready for some use by October.