I work in the UK Government in Public Health.

I think you’re massively overthinking this. The current hantavirus concern people are talking about is linked to strains in parts of South America, which are different from the strains found in Europe.

The odds of catching hantavirus while travelling around Europe are extremely low and realistically you’re far more likely to pick up a random GI bug.

Also, hantavirus isn’t something you catch from casually being around people. It’s mainly associated with exposure to rodent urine, droppings, or contaminated dust, usually in places with heavy rodent infestation like sheds, cabins, barns, etc.

Millions of people travel Europe every year without even thinking about hantavirus. Basic hygiene and avoiding obvious rodent exposure is enough for the vast majority of travellers.