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.
The difference between a bacterial infection and a viral infection can make the difference between a life threatening condition and a harmless one, so you might want to read on. Bacterial infections are caused by bacteria and viral infections are caused by viruses.