GENERAL HISTOLOGY

Detailed explanation-1: -Cytotoxic T-cells attack viruses when activated by an antigen. Natural killer cells don’t need activation to attack harmful cells. Cytotoxic T-cells are part of your adaptive immune response. Natural killer cells are part of your innate immune response.

Detailed explanation-2: -Killer T-cells find and destroy infected cells that have been turned into virus-making factories. To do this they need to tell the difference between the infected cells and healthy cells with the help of special molecules called antigens. Killer T-cells are able to find the cells with viruses and destroy them.

Detailed explanation-3: -T cells can kill cells infected by bacteria. Overall, T cells have been thought to focus mainly on viruses and play only a minor role in defending against bacteria, with neutrophils, macrophages, antibodies and antimicrobial peptides doing the lion’s share of antibacterial work.