Virology
1. Biology: Virus are too small to be seen with a light microscope. Viruses like other microorganism (MOs) e.g. bacteria, fungi, and parasite are the infectious agents that are associated with disease in humans. They are obligate intracellular parasite and they require living host in order to multiply. The virion of the virus particle consists of a nucleic acid (single type of nucleic acid i.e. either DNA or RNA); genome which is packed into a protein coat (capsid) and capsid is enclosed by an envelope of lipid, protein, and carbohydrate. And the scientific discipline concerned with the study of the biology of viruses and viral diseases called virology. 2. Pathogenesis 3. Epidemiology: Epidemiology is the study of the distribution, the dynamics and the determinants of diseases in populations. Viral infection show seasonal differences. Some are prevalent in summer season e.g. enteric fever due to poor hygiene and use of contaminated water. And some are ...
