Patents are designed to protect creations and designs, but how long a patent lasts for is dependent on a number of factors. The length of time that a patent offers protection, depends largely on what type of patent is issued and whether required maintenance fees are paid to keep the patent active. slide 1 of 6.
A viral infection is a disease that can be caused by different kinds of viruses, of which the influenza-virus is best known.
A systemic viral infection occurs in many different systems or organs of the body, as opposed to a localized viral infection, which affects only one part or organ of the body. Because viruses are able to reproduce at a high rate, viral infections can spread quickly throughout the body. Keep Learning.