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.
types of viral infections probably the most common viral infections are respiratory infections infections of the nose throat upper airways and lungs the most common respiratory infections are upper respiratory infections which include sore throat sinusitis and the common cold