"I had to postpone my visit to Tajikistan because several people in my close entourage fell ill. One of them, a person who works in close contact with me, was vaccinated, his antibody titer decreased and he got re-vaccinated, but it appears it was a bit late, as I believe he fell ill three days after re-vaccination. I communicated with him all day long," Putin said.
The Russian president added that his antibody titer is still high.