Why do antibodies increase?

Antibodies increase in response to the presence of pathogens, such as viruses or bacteria, as part of the immune system's adaptive response. When the body detects these invaders, B cells are activated, leading to the production of antibodies that specifically target the pathogens. This process can also occur after vaccination, where exposure to a harmless form of the pathogen prompts the immune system to generate a defensive antibody response. Additionally, increased antibody levels can indicate an ongoing infection or immune response to disease.