It's primarily used in a medical context to describe the process of transferring blood.

Medical Procedure

Often associated with urgent, lifesaving situations.

Emergency Usage

Highlights the direct transference from one entity to another.

Direct Transfer

Used metaphorically to express the spread of intangible things, like feelings or attitudes.

Metaphorical Spread

Can describe a gentle or gradual influence extending to others.

Subtle Influence

Implies that emotions or states can 'flow' from one person to another.

Emotional Transfer

Suggests an infusion of a quality or characteristic into a group or space.

Quality Infusion

Used to convey how non-physical attributes can permeate an atmosphere or environment.

Non-physical Permeation

 medics safely stored and preserved liters of blood, wheeling it directly onto the battlefield to transfuse wounded soldiers. After the war, this crude portable box would become the inspiration for the modern-day blood bank, a fixture of hospitals around the world.

How do blood transfusions...

 So people who are recovered, it appears, have really effective antibodies in their blood. So you could go, transfuse them and only take out the white cells, the immune cells.

Transfuse