The way locals tell it, at least one surprise attack during the siege was thwarted by the monkeys who alerted the night watch to the invaders with their commotion.
This prompts the body to produce a synthetic copy of the virus' attacking properties and eventually the body launches a counter attack against the quote " invader" .
The innate immune response includes cells that are non-specific, meaning that although they distinguish an invader from a human cell, they don't distinguish one invader from another invader.
Many researchers support the so-called " hygiene hypothesis" – the theory that the bacteria, viruses and worms that enter our bodies via dirt are necessary to develop a immune system capable of fighting back against these invaders.
While Alfred's little army slowly began to gather at Athelney, the king himself set out to penetrate the camp of Guthrum, the commander of the Danish invaders.