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Viruses cause a number of diseases in eukaryotes. In humans, smallpox, the common cold, chickenpox, influenza, shingles, herpes, polio, rabies, Ebola, hanta fever, and AIDS are examples of viral diseases. Even some types of cancer -- though definitely not all -- have been linked to viruses.
Pathogens are easily called as infectious agents. We contact pathogens in our daily life. These are microorganisms that cause diseases in host plants and animals; e.g. virus, bacteria, and fungi. Not all microbes are harmful; pathogens refer specifically to the ones that can cause disease in the host.t causes our immune system to produce the antibody against it. Antibody is used by the immune system to identify and neutralize the foreign particles like bacteria and viruses. Basically, antigens are categorized as self-antigen and non-self-antigen.