Hello, I have rheumatoid arthritis and am on methotrexate 25mg per week. I had my first vaccination jab (Astra Zeneca) over 3 weeks ago at the beginning of March. I am in the Biobank study group and I was offered a blood test to check for Covid antibodies. I did my test yesterday and it was negative for antibodies. I've read the responses to the question below from someone else on the same subject and I am very worried that this means the vaccine hasn't worked and I'm not protected against covid, particularly with lockdown easing and infection rates expected to increase. I have been searching this evening trying to find some guidance about this on the NHS website etc and there doesn't seem to be any. So far as I know I won't be offered another antibody test by Biobank so what should I do? Just assume I am not protected? I live on my own and have been very isolated for the last year and the thought of having to carry on like this when everyone else is able to start meeting up etc is very hard. Can anyone give me some advice on this? Thanks.