Another way seems to use Dogs. At least some seem to know. Here a quote from somebody from another messageboard:Posted by DaveToo (here)
Seriously though, with 1/3 (one in three) of the population in many countries who have received the 'jab',
how is it practical on any level to avoid the vaxxed? Especially when you can't spot them (as you can the masked marauders).
from PAPACP:
My dog knows. Normally he is all over my parents. Today after their 2 doses of Moderna, 2 sniffs and walked away from them and stayed away.