Actress Sheila Hancock, 88, recently revealed that she has been warned that the treatment she receives for rheumatoid arthritis (RA) may affect the efficacy of her Covid-19 vaccine More than half of the UK adult population has received the first dose of the Covid vaccine and, for the vast majority, that spells a passport to freedom — but that may not be the case for all. People who have autoimmune disorders, where the immune system mistakenly attacks the body, and those who are undergoing cancer treatments, such as chemotherapy, or living with chronic kidney disease, for example, may need ...