While it is possible, your idea is not really plausible. I get what you’re thinking, but don’t mistake the correlation (that they are there relatively recently) as causation. Do you understand how blaming migrants for diseases is both a cop-out for the state (who receives taxes that provide health services (medical and sanitary))? How about how the fact blaming migrants for disease is proven throughout history to be a very dangerous road? It’s also at its core a racist idea, for one must make the assumption foreign migrants don’t know basic hygiene.
Clear your mind of these frivolous thoughts. No, it’s not migrants brother, it’s our crumbling country.