The following is an excerpt.
(Medical Xpress)—In 1999, researchers at the University of Pennsylvania injected 19 people with a virus carrying a gene designed to correct a rare metabolic disease. Early results appeared promising: Among the first 17 adult subjects, the worst symptom was a fever, an expected response to the modified virus that carried the therapeutic gene.
View the original article here: The gene therapy renaissance: How experimental technique overcame a troubled legacy and is now helping the blind to see