Injecting genes directly into the brains of Parkinson's patients is showing encouraging results, according to researchers.
A study being conducted at the Ohio State University Medical Centre has developed a fluid containing millions of viruses which can be directly administered, re-establishing some of the normal chemistry in patient's brains.
Initial trials of the medication, involving 12 participants, have shown that all patients showed some improvements with over half being markedly better.
Dr Matthew During, who led the study, said: "We get a significant improvement where they are more mobile, more able to live independently and walk around. They don't have the same rigidity and, of course, the tremors are improved."
Dr During added that the majority of participants have continued to improve more than a year after the injections.
Approximately four million people worldwide suffer from Parkinson's with 10,000 people being diagnosed in the UK each year, according to the Parkinson's Disease Society.
Please click here for advice about finding the right type of care.