Viruses
Viruses cannot reproduce on their own. They must invade and infect other cells in order to be able to reproduce.
Antigens: BUT that is only true if the antigens cause a harmful reaction when they invade.
diseaes
Intracellular pathogens.
Pathogens
Pathogens are disease-causing organisms that invade the body. They include bacteria, viruses, fungi, and parasites. These microorganisms can cause infections and illnesses in their host.
Infections of the body are caused by pathogens such as bacteria, viruses, fungi, and parasites. These pathogens can invade the body and multiply, leading to symptoms of infection. Factors such as a weakened immune system, poor hygiene, and environmental conditions can also contribute to the development of infections.
Viruses, bacteria, and so on are called germs, infective agents, microbes, pathogens and so forth.
Pathogenic organisms, such as bacteria, viruses, fungi, and parasites, have the ability to cause infections in other organisms. These pathogens can invade the body, multiply, and disrupt normal functions, leading to an infection or disease.
The immune system plays an important role in the body's defence mechanisms. It destroys and eliminates the pathogens that invade our bodies.
It depends what sort of pathogen it is and what cells are infected but in general the infected cell is destroyed by lymphocytes and then engulfed by a phagocyte to get rid of what is left.
No. Viruses must invade a host cell and hijack its resources to replicate itself.