Slovakia suspended its use after the death of a predisposed recipient.
United States National Library of Medicine.
A robust increase of CD4 + secreting was detected 14 days after both doses in response to stimulation with peptides of the S protein and of other viral particles, but the response to S protein peptides was reduced in the elderly due to a natural reduction of activated CD4 + T cells in this age group, as found in studies of other vaccines.