HIQA: Single shingles vaccine's effect on dementia risk cannot be determined (irishtimes.com)

• HIQA review finds insufficient evidence to confirm shingles vaccine reduces dementia risk.
• Observational studies show mixed results; causal link unproven.
• Further research recommended before policy implications.

"Ireland's HIQA has found it is not possible to determine whether the single shingles vaccine lowers dementia risk. The review analyzed studies on the herpes zoster vaccine and its potential protective effect against dementia, concluding that current evidence is insufficient to establish a causal link. The findings have implications for public health messaging and vaccination policy in Ireland."