Re: OT: Peter Kolchinsky - never heard of this guy before...
"... I assume there's vaccines for horses as well. Wilder is probably familiar..."
In my personal experience, equine coronavirus is a relatively new observation in the US. To my knowledge there is no dependably effective vaccine in use - either preventive or curative. The existing vaccine of which I am aware is mainly to reduce viral shedding - both oral and fecal. Nasal secretions and fecal-oral transmission are normally controlled by isolation and overall stable cleanliness. Our vet has talked at length with us in a community horsekeepers' setting of the inadequacies of the current generation of modified live bovine coronavirus vaccination...vs preventive measures to ensure clean pasture, stables, water supply, and symptom recognition.
In a nutshell, if we have a sick horse, we isolate and treat the symptoms, upgrade their feed, medicate if fever is present, monitor for dehydration, give 'em treats to inspire the appetite, and hope for the best.
A couple years ago we imported a case of the strangles (equine strep) in a rescue horse, and that experience taught us quite a bit about quarantine measures. Our immediate concerns were for the herd health, but my initial research surprised me in that there are actually a few cases in the literature of equine streptococcus infecting humans. As a result, we have lots of N95 masks, nitrile gloves, and hand sanitizer - an unintended consequence that I am pretty darned grateful for...given our current circumstance.