The third dose will be administered at least 28 days following the two-dose regimen of the same vaccine to individuals 18 years of age or older (ages 12 or older for Pfizer-BioNTech) who have undergone solid organ transplantation, or who are diagnosed with conditions that are considered to have an equivalent level of immunocompromise, the agency said in a statement on Thursday.

“Our study adds to an increasing body of research that is looking at different aspects of how COVID-19 might be impacting the brain and brain function,” said study first author Adam Hampshire from Imperial College London in the UK.”This research is all converging to indicate that there are some important effects of COVID-19 on the brain that need further investigation,” Hampshire said.

At least 81 children in the US died of Covid between March and July, according to the Centers for Disease Control and Prevention, and many doctors warn that the situation is likely to get worse.Further, Covid infections in kids is coupled with a rise in cases of a respiratory virus known as respiratory syncytial virus, or RSV, a highly contagious, flu-like illness, that is typically more likely to affect children and older adults. That has shrunk the bed space further in children’s hospitals and expanded on the unrelenting demand on doctors and nurses, the report said.