Hmm and how often does your average hospital have multiple wards all full of patients with exactly the same diagnosis?
I won’t bother waiting for you to look it up because I can already tell you - never. That never happens.
Get your head out of your backside.
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If you were to run a PCR test at 40 cycles for influenza or rotavirus or rhinovirus or any of the other seasonal lineups in a winter ward in any year, and then label all admissions having tested positive as having this diagnosis, then in fact you would have just this.
Note that everyone in hospital, regardless of why they are there (hip replacement, chemo, whatever) is tested for C19. If they test positive, they are considered a C19 hospital case.