They can also potentially mutate further into Crimson Heads and Lickers, which become more beast than man. With certain parts of the brain eroded and others sent into overdrive, hosts are aggressive and always hungry. The necrosis it induces in its human hosts mean that there is essentially no difference between a living and dead infected after a certain point. The T-Virus can infect basically any tissue, including dead tissue that quickly becomes animated. This strain was the result of combining the Progenitor Virus with leech DNA, which had the side effect of producing a vulnerability to fire that has stayed constant throughout the series. James Marcus succeeded in creating the Tyrant Virus at the Arklay Management Training Facility on September 19, 1978. X, Nemesis, and Albert Wesker’s human form. It’s also responsible for the creation of most of Umbrella’s Bio Organic Weapons (B.O.W.s), and thus iconic monsters like the RE1 Tyrant, Mr. It shows that even directly opposed interests can be stabilized by sufficient diversification of strategies on both sides.The T-Virus, or the Tyrant Virus, is the most iconic virus in all of Resident Evil, and is the primary source of its zombie outbreaks. The model shows that it is not necessary to invoke selective effects of multiple species of parasites and multiple species of hosts to explain this diversity of strategies. Some, however, may gain the upper hand and cause disease in individuals with weakened immune systems (e.g., in AIDS patients). The model suggests that, when the change in NRR for different strategies is generated by a random mechanism, which on the average does not favor either player, an antagonistic host-parasite relation will either evolve large numbers of parasite and host strategies or else become evolutionarily unstable. Within these bounds, the probability of a substantial change in average NRR for either player tends to zero as both players diversify. Analysis of the model gives bounds on how quickly each player must diversify, relative to its opponent, to avoid any change in average net rate of reproduction (NRR). This elementary and unremarkable conclusion does not depend on any assumptions about the details of payoffs or the numbers of strategies that the host and parasite currently use. The model implies that it is to each player's advantage to diversify its strategies if the cost of additional strategies can be neglected. For concreteness, the model supposes that the host and parasite contend over changes in the parasite's net rate of reproduction. To focus attention on the number of strategies of each player rather than on the details of payoffs, the model assumes that the elements of the payoff matrix are chosen at random, once and for all. The model is based on a two-player (host and parasite), zero-sum game. At the level of species diversity of hosts and parasites, the model provides a theoretical basis for Eichler's rule. A simple phenomenological model proposed here shows how evolution by natural selection could explain this diversity, and why the diversity of a host roughly corresponds to the diversity of a parasite. The host also has many types of reactions and defenses. In many host-parasite relations, the parasite has numerous variants, antigenic strains, or types.
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