A research group from Keio University and other institutions has announced the experimental results that have found that the new coronavirus easily infects nerve cells that function immune in the brain. The conventional type, the Delta variant, and the virus that artificially reproduced the characteristics of the Omicron variant all infected neurons called microglia.
The reason for these abnormalities was not known. People infected with the new corona may have memory impairment or "brain fog" that reduces thinking ability due to feeling as if they have "haze"