Linked data not available for research within requisite time period

The purpose of this study is to investigate whether there is an association between stroke or heart attack and reactivation of varicella zoster virus, measured by antibody levels, using linked data from the Health Survey for England and secondary care.

This study will use a case control design to investigate whether adult participants in the Health Survey for England between 2009 and 2013 who were admitted to hospital with either a stroke or heart attack had higher preceding levels of varicella zoster virus antibodies measured in stored serum samples compared to matched controls with no history of heart attack or stroke, controlling for a range of potential demographic, lifestyle and clinical confounders.

This study is funded by the University College London Hospitals Biomedical Research Centre Fast Track grant scheme and has received ethics approval (ref 15/NW/0456).

Inclusion Criteria:

• Previous participant in the HSE between 2009 and 2013 with stored serum available.
• Either a record of stroke or TIA or MI in linked HES data between 01/01/2009 and 31/12/2013 or selected as a matched control for those with a record of stroke/ TIA/MI in HES data.
• Male or female, aged 16 years or above.

Exclusion Criteria:

• HSE participant with no stored serum sample

The study population will be drawn from adults who have already participated in the Health Survey for England between 2009 and 2013 and who have a stored serum sample available for analysis. No new participants will be recruited.