It’s not only in the US that meat processing plants and abattoirs are hot spots. One of the places in Australia that flared up was a meatworks, and this in a country where community transmission was generally measuring [until a week ago] at less than a dozen cases per day.
Is it something specific in the nature of the work or the operating environment that causes increased likelihood of transmission? I understand in the US these are places using poorly paid, possibly illegal migrant or non-unionised labour that may be unwilling to rail against unsafe work practices, but I do not think that applies in the same way here.
I’m also aware of the Defense Production Act being used to indemnify meatworks owners and maintain production, which would not help, but does not explain why the transmission issue is so closely associated with them.