Rickettsia prowazekii causes epidemic typhus. It is spread by lice. Brill-Zinsser disease is a mild form of epidemic typhus. It occurs when the bacteria re-activates in a person who was previously infected.It is more common in the elderly.t is spread by lice. Brill-Zinsser disease is a mild form of epidemic typhus. It occurs when the bacteria re-activates in a person who was previously infected. It is more common in the elderly.
In this article. When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD. They are Latin abbreviations: OS (oculus sinister) means the left eye and OD (oculus dextrus) means the right eye. Occasionally, you will see a notation for OU, which means something involving both eyes.
The primary meaning of eye is that of the organ of sight in humans and other animals. Sight is perhaps the most fundamental sense in humans. Eyes are associated with vision in descriptions like prying eyes and sharp eyes, and observation in all eyes, a watchful eye, and keeping an eye on someone. When we are attracted to someone, eye develops the sense 'ogle' in eye someone up. The ability to discriminate with the eyes has led to the meaning of appreciation and taste, particularly in the visual sphere, e.g. an eye for colour, design, detail, quality, and style.