What term is used to describe organisms that cause diseases in humans through contact with infected blood?

The term that describes organisms causing diseases in humans through contact with infected blood is "Bloodborne pathogens." This designation encompasses a variety of infectious agents, including viruses and bacteria, that can be transmitted via exposure to blood and other body fluids. Common examples include Hepatitis B, Hepatitis C, and Human Immunodeficiency Virus (HIV).

Understanding bloodborne pathogens is crucial in emergency medical services (EMS) due to the potential risk of infection when handling patients or performing procedures that may involve exposure to blood. Proper protocols, including the use of personal protective equipment (PPE) and adherence to infection control measures, are essential to mitigate these risks and protect both EMS personnel and patients.

The other terms do not accurately reflect the specific mechanism of transmission through blood. Cross contamination refers to the unintentional transfer of pathogens from one surface or substance to another. Airborne pathogens relate to diseases that can be spread through the air, notably through respiratory droplets. The parasite-host relationship describes a different type of interaction in which one organism (the parasite) benefits at the expense of another (the host), often not involving blood transmission.