Blood donors are screened for possible parasite exposure, and donations are screened for some blood borne parasites, but some do still get through.
https://www.parasites.org/blood-infecting-parasites/
Blood donors are screened for possible parasite exposure, and donations are screened for some blood borne parasites, but some do still get through.
https://www.parasites.org/blood-infecting-parasites/