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.
YOUR EYEGLASS PRESCRIPTION DECODED. Your eyeglass prescription is typically written in a grid like the one below, using a combination of terms, abbreviations, and numbers. Usually youâll see these abbreviations along the left side: O.D. stands for oculus dexter, meaning right eye. O.S. stands for oculus sinister, meaning left eye. O.U. stands for and oculus uterque, meaning both eyes.