a vaccine
eons
vaccine
Organisms can develop diseases most often when their immune system is weakened or compromised, allowing pathogens to invade and multiply. Factors such as stress, poor diet, lack of sleep, and exposure to harmful substances can all contribute to a weakened immune system and increase susceptibility to disease. Additionally, contact with other diseased organisms or environments containing pathogens can also lead to disease development.
Pathogens are microorganisms that can cause disease in a healthy host, whereas opportunistic organisms are typically harmless, but can cause infection in hosts with weakened immune systems. Pathogens are generally more virulent and cause disease more readily than opportunistic organisms.
The immune system can destroy pathogens before they can cause disease. It does this through mechanisms such as the production of antibodies, activation of immune cells like T cells and macrophages, and the release of cytokines to trigger an immune response against the pathogens.
Immunity.
Because our bodies have evolved to defend ourselves from these pathogens. We have an "immune system".
A damaged or weakened pathogen is one that has been altered in a way that reduces its ability to cause disease. This can be achieved through processes like heat treatment or genetic modification. These weakened pathogens can be used in vaccines to stimulate an immune response without causing illness.
Diseases from Europe that the Spanish were immune to affected and weakened the natives.
Introduction of altered antigens involves exposing the immune system to modified versions of antigens to trigger an immune response without causing disease. This approach can be used in vaccine development to stimulate immune memory and protection against specific pathogens or diseases. Altered antigens can include weakened or inactivated forms of pathogens, as well as genetically engineered antigens.
Disease-causing agents like viruses, bacteria, and worms are called pathogens. They can invade the body and cause illnesses by disrupting normal bodily functions and triggering immune responses.
Auto-immune