This can lead to severe anemia, heart failure, or even death.

Grateful for the donors who helped him, he promised to pay it forward.

He was a donor himself, so I said when Im old enough, Ill become a blood donor.

Every batch of Anti-D that has ever been made in Australia has come from James blood.

Harrisons own daughter, Tracey Mellowship, and two of his grandchildren received Anti-D immunizations.

Australian Red Cross Lifeblood estimates that Anti-D donors in Australia help around 45,000 mothers and babies each year.

Their plasma has inspired researchers to expand access to Anti-D treatment worldwide.

While Harrisons passing is a great loss, his legacy will continue saving countless babies for years to come.