Countries that are members of the Organisation for Economic Cooperation and Development.

Microorganisms that are normally commensal and do not harm their host but can become pathogenic and cause infection when the host's immune defences are compromised.

Membrane-bound components of eukaryotic cells that are specialised to carry out particular functions.

The process by which water moves through a partially permeable membrane from a less concentrated solution of, for example, salt (where there is a relatively high concentration of water and a low concentration of salt) to a more concentrated one (where there is a relatively low concentration of water and a high concentration of salt).