Classification of virus • Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. • Viruses range from the structurally simple and small parvoviruses and picornaviruses to the large and complex poxviruses and herpesviruses. • Viruses are classified on the basis of morphology, chemical composition, and mode of replication. • The viruses that infect humans are currently grouped into 21 families, reflecting only a small part of the spectrum of the multitude of different viruses whose host ranges extend from vertebrates to protozoa and from plants and fungi to bacteria. On the Basis of Genetic Material Present • Viruses are small, nonliving parasites, which cannot replicate outside of a host cell. • A virus consists of genetic information — either DNA or RNA — coated by a protein.  • Accordingly, they are classified as DNA viruses and RNA viruses. • The nucleic acid may

 Body fluid compartments    By   Dr. Gouse Mohiddin Shaik  • Most abundant substance present in our body is “water”  • About 60% of healthy human body weight is water  • Water is distributed in different compartments of our body        • Intracellular fluid compartment  • Is the fluid compartment of the body consisting of all the water present within the cell  • Water is present out of the cells is called extracellular fluid  • Non-circulatory water present around the cells is called intersterial fluid  • Circulatory water in the blood is present as plasma      Intracellular fluid Extracellular fluid      40 % Dry weight 60% total body water      Innate immunity  • Intracellular fluid  • Rich in potassium (K) and magnesium (Mg)  • Rich in proteins  • Extracellular fluid  • Rich in sodium (Na)  • Rich in Chlorine (Cl)  • Plasma  • Rich in sodium (Na)  • Rich in proteins  Intracellular fluid Extracellular fluid        Na