Yes, but it's not evolution. From that page- > A study among expatriates in Nepal suggests that immunity may take up to seven years to develop—presumably in ad

Yes, but it's not evolution. From that page- > A study among expatriates in Nepal suggests that immunity may take up to seven years to develop—presumably in adults who avoid deliberate pathogen exposure.[18] Conversely, immunity acquired by American students while living in Mexico disappeared, in one study, as quickly as eight weeks after cessation of exposure.[19] I suspect it's your gut flora that adapts; but it's not your DNA.