Donor blood comes with risks for all patients, including the potential for immune reactions and infections.
One potential problem is that antirejection drugs might be required to prevent adverse immune reactions from the scaffold.
No such antibodies were found, an indication that none of the people had had immune reactions to the corn protein.
But there can be dangerous side effects, including severe immune reactions or accidental infection with other viruses.
Typhoid vaccine was given, since it prompts immune reactions; so was quinine, because it breaks malarial fevers.
When a new virus emerges, deaths may occur in healthy adults who mount the strongest immune reactions.
The international team, involving scientists from Harvard, MIT and University College London, found that the patients in their study had already launched immune reactions against their cancers.
These cause allergic or immune reactions in about one person in a hundred.
Regulatory T cells act to control immune reactions, hence their name.
Years later, the antibody was changed to make it chimeric - part human, part mouse - to reduce the immune reactions in patients.
But when the chimps developed kuru two years later, Dr. Gajdusek theorized that a slow-acting virus was at work, somehow not producing the expected immune reactions.
