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I agree wholeheartedly with Helen Salisbury's comments regarding testing. Though I retired 6 years ago (and therefore not eligible for re-registration) I could still volunteer if I knew what my infection status was, as I have also been told to self-isolate for 12 weeks due to COPD.
Covid-19 antigen testing is only of value in symptomatic persons with mild disease: a negative test can allow a return to normal activity. Antigen testing is of little value in the seriously ill as it fails to change treatment.
Antibody testing in NHS staff, carers and the vulnerable would be of great value. If I were shown to have antibodies ( and presumably immune ) it would permit a return to normal life and permit a contribution to society.