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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.
Diseases caused by the single-celled protozoans include amoebic dysentery, babesiosis, cryptosporidiosis, intestinal giardiasis, malaria, and vaginal trichomoniasis. Viral: The most common type of infectious disease that humans are susceptible to are viral. Viruses cause a host of diseases and are tinier than bacteria as well. The most frequent disease that constantly affects humans on a day-to-day basis is the common cold, caused due to a viral infection.