Sorry folks.... this is a long post !!
The Shingles vaccine used in the UK is Zostavax, available to over 70s as a single dose. It contains weakened (attenuated) virus and as such, can cause problems (i.e. infection) for people with weakened immune systems (for example, due to medication). Zostavax is only 50 to 64% effective in preventing Shingles (and even less so the older you are).
The vaccine used in the USA is called Shingrix and has been shown to be more than 90% effective. (They are no longer using Zostavax in the USA).
You need 2 doses of Shingrix (one, followed by a booster 2 to 6 months later). Shingrix does not contain live varicella zoster virus, only a small part of it that produces an immune response in the body, and as such it can be used in immunocompromised patients.
I had a mild dose of Shingles in early 2017 and shortly afterwards developed symptoms of GCA. I am convinced Shingles triggered GCA for me, and there is evidence that 78% of temporal artery biopsies from patients with GCA had the Varicella zoster virus in the cells.
(References, for nerdy people like me who might like to read scientific papers
1. oatext.com/pdf/CMR-2-115.pdf
2. Gilden D (2015) Prevalence and distribution of VZV in temporal arteries of patients with Giant Cell Arteritis. Neurology 84: 1918-1919)
Like most people in the UK, I was offered the Zostavax vaccination just after I reached 70. Unfortunately, I had just started injections of Tocilizumab and so could not have the live Shingles vaccination. (Whilst on Tocilizumab, I have had a mild Shingles outbreak, but knowing what to look for, I immediately got my GP to prescribe Aciclovir which cleared it up in 8 days).
I have a dear friend who had really dreadful Shingles more than 3 years ago. He has been on morphine for the terrible pain and it still shows no signs of ever disappearing.
My conclusion is that we should be able to get Shingles vaccinations in the UK from the age of 50 (as in many other countries). 70 is far too late. We should also be using Shingrix and not Zostavax. Of course, it is all down to money, but it is false economy when you see the devastating effect Shingles can have on people’s lives. (I have been looking into getting Shingrix privately though apparently it costs £525, and is currently unavailable anyway).