"One possibility: a leading hypothesis pursued by researchers (and funders) was built on science that now appears to be fraudulent."
Possibly the most likely possibility?
There are multiple factors, but the one that contributes the most is that it's actually a very challenging disease to study and improve on.
1. It acts on the brain, one of the organs we understand the least.
2. It's relatively slow acting, and easy to miss in the early stages.
3. It impacts the older population which will have confounding health factors.
4. It doesn't fit neatly into a big category we already know a lot about, like infection or cancer.
[dead]
There are multiple factors, but the one that contributes the most is that it's actually a very challenging disease to study and improve on.
1. It acts on the brain, one of the organs we understand the least.
2. It's relatively slow acting, and easy to miss in the early stages.
3. It impacts the older population which will have confounding health factors.
4. It doesn't fit neatly into a big category we already know a lot about, like infection or cancer.