IMO, For the feds to step in over the local jurisdictions generally means they believe the contamination was at a processing facility, and shipped across state lines.
Because this outbreak has now shown up in Oregon (or Washington i forget which one it was), Boston and now California i think the Feds have decided that they have to be involved and will work alongside each state agency.
When i heard about the first case, i wasn’t concerned. Then as we keep hearing about more outbreaks, now i am getting concerned. To me this says they have multiple infection vectors or someone is maliciously tainting the supply chain. Either way, i have my doubts if they will survive this.