Is a flu outbreak an "unforeseeable event" that your work can cancel on you without pay?

I'm a CNA. My union says that my workplace can cancel shifts with next to no notice due to "unforeseeable events". It lists natural disasters and outbreaks of illness as potential unforeseeable events.

We went into a flu outbreak today. I work on the flu unit and have all week, but I picked up a shift on a non-flu unit right after my shift on the flu unit. They cancelled that non-flu unit shift two hours before it started due to us being in outbreak.

I asked them why? And they said it's policy that staff working on a flu unit can't go to non-flu units. This left the non-flu unit short when I was willing to work.

My union rep says that there's nothing that can be done but that I could argue that I wasn't offered the additional hours on the flu unit instead.

I feel like eve since I got back from mat leave, they've been fucking me over.

Has anyone ever had this happen? I'm with SEIU and working in a nursing home.

Kim: any time I apply for overtime they turn me down and say more senior people picked it up but the units are still short staffed. When I ask if I can pick up shifts they tell me there's nothing available but the units are short staffed. If I ask them about it they say "Oh people call in you have to answer the shift request" and I'm like I would but you don't put them out. They just fuck me over constantly!