I would be very interested to hear from anyone who thinks there is an unusually high prevalence of PD in their area.
About one in 500 people in the UK have Parkinson's. So, at first sight, it would seem to be very unusual for there to be two people in a street with PD. But, for a number of reasons it is not so rare:
- The chances are that any report is biased by the fact that many people reading this will have PD. Their area already has at least one PwP, with probability one.
- Given that there are thousands of areas, some will just by chance have a higher than expected number of cases.
- Some areas will have a higher than average number of older people.
- Genetics: because families tend to live close together any genetic association is likely to appear as a geographical association.
That said, if we were to identify a cluster, it might help in finding the cause of Parkinson's.