Sure, should be LESS THAN 40% as reported from real world data in Israel.Indeed. 170 people are a lot, not everyone passing by or sharing something with every others. I won't be surprised if the actual protection is lower than 50%.
23 Jul 2021
Israel says Pfizer Covid vaccine is just 39% effective as delta spreads,
but still prevents severe illness
That was for delta.
I expect it to be even less for Omicron, unfortunately.