https://equinediseasecc.org/alerts
The first confirmed case was on May 17, since then 3 more are positive.
Horse shows are affected and requiring horse inspections on arrival at the show grounds.
The Canadian border is closed to horses from California.
More cases in San Diego now, and a few new ones in Riverside County.
I’m in San Diego, but currently no cases nearby. I really wish they could be a little more specific about locations, like zip codes maybe. San Diego county is pretty huge - 4,000 square miles.
I was reading a social media page yesterday for San Diego equestrians. Sorry I don’t recall the name of it. People posted that case(s) were in Alpine, and maybe they said Dulzura too. Vets have said it’s definitely in Ramona and Rancho Santa Fe.
I’m near Norco, have not heard of any cases here.
Here’s today’s update on the Equine Disease Communications Center website:
"Since the start of the outbreak, 26 VSV-affected premises have been identified (9 confirmed positive, 17 suspect) in 1 state, California. Twenty-five (25) of these premises have had only equine species clinically affected in 2 counties (Riverside and San Diego Counties) and one (1) premises has had clinically affected cattle (San Diego County). "
(their bold lettering, not mine)
Here is the most updated situation report (5/22/2023) for Riverside and San Diego counties.
And the California Dept of Food & Agriculture equine alert:
https://www.cdfa.ca.gov/ahfss/Animal_Health/VS.html
The USEF alert:
USEF will be having a webinar on May 31, see link above to register.
Wednesday, May 31, 4 p.m. ET
Vesicular Stomatitis: What You Need to Know
Presented by Dr. Katie Flynn, USEF Equine Health and Biosecurity Veterinarian, and Dr. Angela Pelzel McCluskey, USDA Equine Epidemiologist
Dr. Angela Pelzel McCluskey will provide an overview of vesicular stomatitis and the current situation report. Dr. Pelzel McCluskey will provide perspective based on her firsthand experience managing numerous VS outbreaks in her previous roles. Dr. Katie Flynn will cover prevention measures for horses and their premises, as well as the biosecurity requirements being implemented at those USEF events with horses competing from VS-affected states. You won’t want to miss this critical and informative session!
Excellent webinar by USEF just now. Very informative.
Thanks USEF and USDA.
You beat me to it!
I was surprised to hear that the titers last for YEARS in exposed horses and that they provide NO protection against re-infection!
ETA: reminded that titers are an indication of antibodies being present and are not the same as immunity.
Proof that titers alone, which are only a measure of antibodies, are not the same as immunity. The humoral, and cell-mediated parts of immunity, both work together.
Good point, I’ll edit appropriately.
USDA Situation report from June 2. Spread into San Bernardino County, parts of which are adjacent to Riverside County. All three of the affected counties are huge. Given the typical incubation time of 3-5 days and range up up 8 days, any cases from last week’s shows should start to pop up in non-contiguous counties about now.
Some of the smaller USEF shows have cancelled due to not being able to comply with the new USEF Protocols.
Thanks for posting… I am super annoyed at non USEF events (especially events with both cattle and horses) that are still going on … did we learn nothing from EHV-1 last year?
Now confirmed in Orange County, as of the June 6th notification.
When I’ve spoken to random horse people in my area, they seem a bit disinterested. Then I mention that they can catch it from an infected horse, and suddenly they become interested. 
Yes big counties:
San Diego: 4261 square miles
Riverside: 7303
San Bernardino: 20105 !!!
Yup. All bigger than at least some states. I think San Bernardino is bigger than any state in New England.
Would be useful to know WHERE in OC. Some parts, e.g. Brea, are contiguous with San Bernardino county. According to the USEF webinar you can call the state agriculture department and get a city.
Interesting about Brea.
I was thinking in or around San Juan Capistrano.
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