Purpose. The system of rating securities was originated by John Moody in 1909. The purpose of Moody's ratings is to provide investors with a simple system of gradation by which future relative creditworthiness of securities may be gauged.urpose. The system of rating securities was originated by John Moody in 1909. The purpose of Moody's ratings is to provide investors with a simple system of gradation by which future relative creditworthiness of securities may be gauged.
Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected whitefooted mice.However, certain other species on which the larvae feed do not harbor the bacterium.y gagansb Sat Aug 22, 2009 4:52 am. Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected whitefooted mice. However, certain other species on which the larvae feed do not harbor the bacterium.
Lyme Disease Causes. The bacterium that causes Lyme disease is called Borrelia burgdorferi. People get infected through a bite of an infected black-legged tick, which feed from mammals, birds, reptiles and amphibians.Humans may get bit by a tick when walking through high grasses and shrubs.he bacterium that causes Lyme disease is called Borrelia burgdorferi. People get infected through a bite of an infected black-legged tick, which feed from mammals, birds, reptiles and amphibians.