Safety should be used at all times when it comes to employees. Making sure they were there universal PPE to keep them safe from blood. With this it can be assumed that all blood is contaminated and should be treated that way. 

Bloodborne pathogens can be transferred through the mucus membrane on the face, eyes, and nose. This is a concern and a reason why proper face or eye protection should be worn when dealing with blood. 

Bloodborne pathogens can cause serious damage to the human body including death. HIV is a risk when dealing with blood. Always have caution when dealing with sharp needles.