If sensitisation occurs, the next time the woman is exposed to RhD positive blood her body will produce antibodies immediately. Scientists are collecting and cataloging his DNA to create a library of antibodies and white blood cells that could be the future of the anti-D program in Australia. The mother's body treats the blood of the fetus as a foreign invader and attacks with antibodies.
"I'd keep going if they let me", Harrison told the Herald. "It's one of my talents, probably my only talent, is that I can be a blood donor".
But he has already surpassed the donor age limit and the Blood Service made decision to protect his health.
'Medications like Anti-D are a life-giving intervention for thousands of Australian mums, but they are only available because men like James give blood'.
Sensitisation happens when a woman with RhD negative blood is exposed to RhD positive blood, usually during a pregnancy with an RhD positive baby. His mother, Kristy Pastor, first received the Anti-D injection during her second pregnancy.
The discovery of Harrison's antibodies was an absolute game changer, Australian officials said. More than three million does of Anti-D have been issued to Australian mothers with negative blood types since 1967. "He will have to retire in the next couple years, and I guess for us the hope is there will be people who will donate, who will also. have this antibody and become life savers in the same way he has, and all we can do is hope there will be people out there generous enough to do it, and selflessly in the way he's done".
The 81-year-old Australian has donated more than 1,100 times since turning 21.
That would be more than two million lives, according to the blood service, and for that Harrison is considered a national hero in Australia. "I can't stand the sight of blood, and I can't stand pain".