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.
Best Answer: O. S. stands for oculus sinister, which is Latin for left eye. O. D. stands for oculus dexter, which is Latin for right eye. Sph. stands for spherical lens. For the best answers, search on this site https://shorturl.im/aw8XR In Contact Lens and Glasses prescription OD means Right Eye and OS means left eye. If u want to remeber this,since in alphbets D comes before S,so first right then left eye. This Site Might Help You.