Vaccines contain dead or weakened versions of a virus. The body then develops a defense against this virus so that the next time the real virus comes along, the body can identify it and fight it off.
This process of defense development takes place in the immune system of the body. Specialized cells (called b-cells) are created by the bone marrow. These are the cells that produce antibodies. Antibodies work to attack and disable antigens (foreign particles or organisms that have invaded the body, or that the body thinks are invaders). Once the body has developed antibodies for a particular invader, the pattern of those antibodies is stored by the immune system, and duplicates can be readily produced to attack if that invader, or one like it, is detected again. That is what gives you immunity.
See the related questions below for additional information.
Chat with our AI personalities
Vaccines contain antigens that can stimulate the immune system to produce antibodies and memory cells. Memory cells are a type of immune cells that "remember" the antigen and can quickly respond when the body encounters the pathogen in the future, providing immunity.
Yes, plasmids can be used in DNA vaccines to fight bacteria by expressing antigens that trigger an immune response. Bacteriophages can also potentially be used in vaccines by delivering antigens or genes into host cells to stimulate an immune response against bacteria.
Hematopoietic stem cells are responsible for giving rise to all immune cells, including T cells, B cells, and natural killer cells. These stem cells are found in the bone marrow and have the ability to differentiate into various types of blood cells that make up the immune system.
Following a primary immune response, memory cells are generated from activated B and T cells. These memory cells can recognize the same pathogen if encountered in the future, leading to a faster and stronger secondary immune response. Memory cells are vital for the immune system's ability to provide long-lasting protection against specific pathogens.
The ability of a specific immune cell to proliferate and form many generations of nearly identical cells is called clonal expansion. During clonal expansion, activated immune cells undergo multiple rounds of cell division, resulting in the production of numerous identical daughter cells that can mount a coordinated immune response against the targeted pathogen or antigen.
Yes, antigenic proteins from specific pathogens can be used to develop vaccines. These proteins can stimulate the immune system to produce antibodies and memory cells that can recognize and protect against future encounters with the pathogen, thereby providing immunity.