What happens if a virus passes the first line of defence?

Answer 1

If a virus successfully passes the first line of defense, which includes physical barriers like skin and mucous membranes, it may trigger the body's innate immune response. This response involves immune cells such as macrophages and neutrophils that identify and attack the virus. If the virus persists, the adaptive immune system is activated, leading to the production of specific antibodies and T cells to target and eliminate the virus. This multi-layered defense helps the body combat and ultimately clear the infection.