The presence of disease across large areas, usually countries, continents, or even the whole world.

Immunity gained by administering pre-prepared antibodies to the body.

A vaccine developed by chemical production of substances that stimulate the immune system against  infectious agents (bacteria, viruses, parasites) without using any living organism.

A substance that has no medical/therapeutic effect but has a psychological effect.

The phenomena in which a substance with no therapeutic effect brings about an effect based on the belief that it will bring about an effect.

A type of bacteria that causes serious infectious diseases in different parts of the body.
See Streptococcus pneumoniae, commonly causing lung infections. 

Inflammation of the lung parenchyma.

Substances that keep a vaccine effective throughout its storage period.

Measures, mostly medical, designed to prevent the development or deterioration of diseases.

A complex molecule that forms the main substance of living cells and consists of a combination of structures called amino acids (usually containing nitrogen, sulfur, oxygen, and carbon elements).