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It’s possible that a coworker’s blood is contaminated with bloodborne pathogens and your coworker doesn’t know it. In many cases, a person is a carrier or just in the early stages of what will be a deadly disease. So there are few, if any outward symptoms to alert anyone.
Another person infected by that blood could become seriously ill or even die. You need to assume that all blood from other persons carries disease, and treat it accordingly. This doesn’t mean you need to run for the nearest exit if a coworker gets a scratch or even bleeds copiously from a severed artery. It does mean you need to understand and apply the basic blood safety steps. They are:
Source: Mark Lamendola | Mindconnection