This happened in my county, and the Fire Dept used the same meat supplier I use. I bought meat the same day that they did and catered a party for the local District Attormey's Office. The folks that I catered for are happy and healthy.
We must always be aware of the dangers of not following food safety guidlines. This is a perfect example. You can not trim raw tri tip on a cutting board and then later cut the cooked tri tip on the same unwashed cutting board----but people do it.
The rumor up here is that the method that was used to marinate the meat is being investigated. I feel deeply for the people that became sick. I am also sure that the Health Dept will be visiting all BBQ caterers in this county.
Now---to all of you jokesters that got word of this and called me to see if I was the caterer---well nevermind