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.n 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.
Map of the fortifications. Located in Canada, the Ramparts of Quebec City are the only remaining fortified city walls in North America north of Mexico. The British began refortifying the existing walls, after they took Quebec City from the French in the Battle of the Plains of Abraham in 1759.
1 Fort Edmonton. 2  The Hudsonâs Bay Company built Fort Edmonton in 1795 on the North Saskatchewan River as local competition for the North West Company trading fort nearby. 3  There was a large aboriginal population in the area, and furs were abundant. The Hudsonâs Bay Company was quick to mimic the success, and built Fort Wedderburn and Nottingham House in the area. 2  Competition between the Hudsonâs Bay and North West Companies also led to expansion along the North Saskatchewan River.