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Yes, if you're in close proximity with someone with cancer you will not get their cancer after getting the vaccine. Before too.



That's actually 0% effective.


I think 0 / 0 is more like infinity effective.

That said, dogs and tasmanian devils do have transmissible cancers: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4698198/


I'm pretty sure anything over 100% implies some sort of necromantic rising of the dead. An infinity would surely lead to collapse into blackhole and I think we'd know.




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