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INFECTION CONCEPT. Humans may hold dominance over most other life forms on Earth, but a few varieties of organism have long held mastery over us.Ironically, these life forms, including bacteria and viruses, are so small that they cannot be seen, and this, in fact, has contributed to their disproportionate influence in human history.

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Low temperature steam and formaldehyde. Formaldehyde is a colorless gas, but it is normally distributed as a solution (generally referred to as formalin) and is known to most people within hospitals as an important disinfectant that has been in use since the late 1800s (Weber Tschopp et al., 1977).

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