Definition of courier: An individual responsible for the exchange of items between two or more parties. Couriers are usually employed by a company that charges a flat rate to the party using the courier service. Federal Express, UPS, DHL, and the United States Post Office all employ couriers to deliver mail and packages.
At least 3 bacterial morphotypes, as well as fungal mycelia, thelastomatid nematodes, and ingested material are found in the hindgut. At annual molt, the lumen bacteria virtually disappear; presumably they are replaced from anterior gut regions, ingested exuvium, and ingested soil.
Pathogens: bacteria. Structure of a salmonella bacterium cell. Bacteria and viruses are the main types of pathogen. Bacteria are microscopic organisms. They come in many shapes and sizes, but even the largest are only 10 micrometres long-that's 10 millionths of a metre.