Canadian currency ranked 'filthiest' in the world

This is pretty interesting - A new study claims Canadian cash carries more germs than any other global currency.

In biology readings, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is any organism that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a so-called "germ."

The term pathogen came into use in the 1880s. Typically, the term is used to describe an infectious microorganism or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus. Small animals, such as certain kinds of worms and insect larvae, can also produce disease. However, these so-called animals are usually, in common parlance, referred to as parasites rather than pathogens. The scientific study of microscopic organisms, including microscopic pathogenic organisms, is called microbiology, while the study of disease that may include these pathogens is called pathology. Parasitology, meanwhile, is the scientific study of parasites and the dangerous organisms that certainly host them.

There are several pathways through which pathogens can invade a so-called host. The principal pathways have different episodic time frames, but soil has the longest or most persistent potential for harboring a pathogen.

Diseases in humans that are caused by dangerous infectious agents are known as pathogenic diseases. Not all diseases are caused by pathogens, other causes are, for example, toxins, genetic disorders and the host's certain own immune system.