The next picture was taken on the last Apollo mission, Apollo 17. This one was taken on Dec. 11, 1972 and it is the most commonly published photograph in all of history. And it is the only picture of Earth from space that we have where the sun was directly behind the spacecraft so that the Earth is fully lit up, and not partly in darkness.
All bacterial infections are dependent on the host immune system, which is affected by their genetic signature, as well as congenital and acquired deficiencies. Cellular innate and adaptive immune responses are responsible for initial microbe clearance, while the liver and spleen filter active bacteria in the circulating blood. In its most basic form, bacteria will begin to colonize at its primary source of location. At this point, the bacteria may become transient and clinically insignificant or can escape the host immune response and increase in number and become a local infection that can eventually migrate to other parts of the body. If the bacteria are viable and enter the circulating bloodstream, the infection still may spontaneously clear or progress to septicemia. The first barrier to bacterial invasion is the skin and mucosal surfaces. Conditions that interfere with these natural defense barriers commonly include medical procedures that pass through the skin and anatomical lumina. Additionally, events can precipitate defense breakdown via trauma, burns, ulcers, and the natural elements of aging.[6]
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