add a comment |. up vote 1 down vote. If a game has a value, it need not to have a mixed strategy Nash equilibrium. In the Von Neumann's Minimax theorem stated above, it is assumed that, for each player, the set of mixed strategy best responses is nonempty given the other player's mixed strategy.
Not all RNA viruses are retroviruses, e.g., the measles virus and flu virus are RNA viruses, but not retroviruses. There are three families of retroviruses: oncoviruses (causing cancer), lentiviruses (slow viruses, of which HIV is one), and foamy viruses or spumaviruses (about which much less is known).
There are several different types of viruses, including DNA, RNA, and retroviruses. DNA viruses usually replicate by taking over the cell's DNA, whereas RNA viruses tend to replicate in the cytoplasm. Retroviruses transcribe their DNA into host DNA via reverse transcription- an example of this is HIV. The body has several defense mechanisms against viruses. The body's first line of defense is the innate immune response, which is non-specific and defends the body against a variety of threats.