he was 84 years old. this, if anything, reaffirms the need for people to get vaccinated to protect people like general powell. >> when we talk about herd immunity, just sort of philosophically it means enough people get vaccinated that you protect the most vulnerable among us. people who can't get vaccinated or are vulnerable because of age, because of talking about his multiple myeloma which is a difficult cancer when it comes to immunity. this is cancer of the very cells that produce the antibodies, right? so it's the plasma cells that produce the antibodies. we also know we can put it up that about 45% of people who get vaccinated only have about an -- have an adequate response to the vaccine. 22% have a partial response. and 33% have no response. so we don't know where he fell in there but that was also -- that's why it's been suggested that people who have weakened