To clarify, this is my own opinion***
Approximately 40% of horses in Spain carry piroplasmosis and never show any symptoms. Yes, even horses competing at a high level can be piro positive without any clinical issues in their daily lives
Unfortunately, for countries outside of Europe (except the UK), horses must test piro negative to be imported. Because of this (Because they can’t travel to those countries) piro positive horses often have a lower price , which can be a great opportunity for buyers within Europe or the UK.
Please, if you have questions about piroplasmosis, instead of going crazy Googling it (which will probably tell the horse has ten minutes to live just like when you Google a headache in humans đ), talk to a vet in Spain or Portugal, or one who has REAL experience working with horses here.
Information based on experience is always far more valuable than online alarmism.