Sagar Aryal, PhD 
Bone Marrow is the soft, highly vascular and flexible connective tissue within bone cavities which serve as the primary site of new blood cell production or hematopoiesis. In adult humans, bone marrow is … Read more
Immunization is the process whereby a person naturally acquires or is induced to acquire immunity or resistance to an infectious disease. An individual can acquire such immunity either passively or actively … Read more
Complement refers to a set of serum proteins that cooperates with both the innate and the adaptive immune systems to eliminate blood and tissue pathogens. Various complement components bind and … Read more
Structure of Norwalk Virus (Norovirus) The virus is non-enveloped, round, 27-nm particles with a ‘ragged’ outer edge but lacking a definite surface structure. It has a buoyant density of 1.33–1.41 g/cm3, … Read more
Lymph nodes are small solid structures placed at varying points along the lymphatic system such as the groin, armpit and mesentery. They contain both T and B lymphocytes as well … Read more
Major Histocompatibility Complex (MHC) is a part of the genome of all vertebrates that code for molecules which are important in immune recognition. In humans, the MHC is a cluster … Read more
The thymus is a lymphocyte-rich, bilobed, encapsulated organ located behind the sternum, above and in front of the heart. The activity of the thymus is maximal in the fetus and … Read more
Hypersensitivity refers to increased reactivity or exaggerated immune response of a host to an antigen to which it has been previously exposed. According to the most widely accepted classification of … Read more
Habitat of Streptococcus pneumoniae Morphology of Streptococcus pneumoniae Genomes of Streptococcus pneumoniae
Koch’s postulate forms the very basis of the pathogenic microbiology. The causality of almost all infectious diseases is based on the postulate and theories developed by Robert Koch, who is … Read more
