Two focal lengths we featured were the 35mm and the 50mm primes. The two lenses that outperformed the available choices were no surprise. The Canon 35mm f/1.4L lens for the 35mm focal length and the Canon 50mm f/1.2L lens for the 50mm focal length.
The flu is a contagious respiratory disease that can cause mild to severe illness, and can even lead to death - CDC The Flu is a contagious respiratory disease that can cause mild to severe illness, and can even lead to death - CDC Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content
Definition of influenza for English Language Learners. medical : a common illness that is caused by a virus and that causes fever, weakness, severe aches and pains, and breathing problems.