Consider the fragility of human existence. We survive within a specific set of environmental parameters – a fixed range of temperature, hydration, radiation, and atmospheric content. From a cosmic perspective the margin of error is very small; the slightest adjustment in even a single factor, such as the amount of oxygen, quickly moves the environment from pleasant to deadly. Yet we have learned how to venture into the realm of the deadly when necessary. Thanks to protective clothing, equipment, and protocols, our species can operate within the vacuum of space, in the ocean’s depths, in the radiation-charged atmosphere of a nuclear reactor, and in the hot zone of an infectious disease laboratory.
We venture into these deadly environments, but we do not live there. We cannot survive there without observing the strictest standards. Those who enter these realms understand this. Astronauts, deep sea explorers, nuclear engineers, and epidemiologists are professionals who have answered the call to highly specialized career fields. Not all who enter the paths of these professions advance to the point that they can operate confidently in the most dangerous places. The selection and training standards must be established at the highest possible levels for the simple reason that the slightest error can produce lethal results. Richard Preston explained this principle in The Hot Zone, an investigative look into the origins of viral hemorrhagic fevers like Ebola. We learn from his book that the protocols for entering, working in, and leaving an infectious disease lab are elaborate and time-consuming, but necessary. No amount of caution is excessive when microscopic killers can infiltrate through the tiniest puncture of a protective suit or escape through an improper seal of an airlock. The viruses create the hot zone, whether it is in the lab or in the human body. Because of the radical transformative nature of these microorganisms, the highly trained professionals who work with viruses like Ebola in a very real sense act as mediators between them and the general population.
In fact, the role of these professionals is not unlike the role of the Levitical priests.