The two-dose mRNA Covid-19 vaccine may be less effective’ in people undergoing treatment for certain types of blood cancers, researchers have claimed in two new studies.
The studies, published in the journal Blood, suggest that the mRNA Covid-19 vaccine may have reduced efficacy in people with chronic lymphocytic leukemia (CLL) and multiple myeloma, — two types of blood cancer — compared to healthy people.
However, vaccination against Covid-19 is strongly recommended in both groups, the researchers said.