The below mentioned article provides a short note on Corona Viruses. Introduction to Corona Viruses: Corona viruses (Corona, meaning crown) are spherical (100-150 nm in diam.), pleomorphic, enveloped RNA viruses containing petal- or club-shaped peplomers (spikes) on the surface. Pathogenesis of Corona Viruses: They are widespread in nature and infect a wide range of hosts. They have a variable tissue [...]
The following points highlight the two main groups of slow virus disease. The groups are: 1. Animal Infection 2. Human Infection. Slow Virus Disease: Group # 1. Animal Infection: a. Visna: It is caused by viruses which are classified under the family lendviridae (See AIDS) as retro viruses and also cause a demyelinating disease in sheep with incubadon period of [...]
In this article we will discuss about Rickettsiae:- 1. Cultivation of Rickettsiae 2. Animal Inoculation of Rickettsiae 3. Laboratory Diagnosis 4. Resistance. Cultivation of Rickettsiae: All rickettsiae cannot be grown on cell free media, except R. Quintana which will grow on blood agar medium. They can be cultivated in yolk sac of chick embryo, grow on mouse fibroblast, HeLa, Hep2 [...]