For context, the evidence-based consensus as of now is that felines (including pet cats) can catch covid-19 from humans and then transmit it to other cats and maybe other humans, but they are not as susceptible to catching it as humans are. It takes a massive initial viral load for your cat to catch it from you and it will develop only a mild expression of the coronavirus. Dogs do not seem to catch it, but that doesn’t mean they haven’t tested positive due to second-hand exposure/contamination (from licking their human friends).

Note that the original SARS was likely transmitted to humans from its original hosts via a feline intermediary, so scientists were not at all surprised by these findings as the similarities between the two SARS are very high.

So it’s not a big surprise that tigers can catch it too.