Clinical Trial: A research study that is carried out to evaluate the safety and efficacy of new medicines in humans before registration and manufacturing. A clinical trial prospectively assigns human participants or groups of humans to one or more health-related interventions (usually drugs or vaccines) to evaluate the effects on health outcomes and is generally divided into three separate phases.
Immune System: A defense system of the body consisting of the organs, tissues and cells that provides protection against infectious agents and toxins. Organs include the thymus, bone marrow, and lymph nodes.
Serotype: A serologically (serum-specific) distinguishable strain of a microorganism.
Vaccine: A medicinal preparation containing harmless forms of microorganisms that cause a particular disease or several diseases. It is usually administered by injection to provide protection (immunity) against the disease(s).
Virus: A group of very minute microorganisms that can only be observed through an electron microscope. These can infect living organisms, including bacteria, plants, animals, and humans thereby causing disease.