Immunity – the immunity of the human body to infections. There is a natural innate immunity when antibodies are passed to the child in the mother’s blood; natural acquired, formed after the transfer of any disease, for example, chickenpox; artificial active, appears after vaccination – administration of a vaccine from killed or weakened pathogens to the body to transfer a disease in a mild form, for example, poliomyelitis; artificial passive, appears with the introduction of therapeutic serum containing ready-made antibodies, for example, against tetanus.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.