Anti-Rh antibodies can develop in an
AB+ patient, if he receives blood from an O-donor
Rh+ patient, if he receives blood from an Rh-donor
Rh+ donor, if he donates blood to an Rh-patient
Rh- patient, if he receives blood from an Rh+ donor
An Rh- person, if exposed to Rh+ blood, will form specific antibodies against the Rh antigens.