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Introduction Coronavirus is a group of spherical or pleomorphic medium-sized (100-150 nm), enveloped RNA virus, containing pectal or club-shaped peplomers on the surface as shown above picture. Their name coronavirus is due to the crown shape, corona meaning crown. These viruses belong to family Coronaviridiae and there are four genera Alphacoronavirus, Betacoronavirus, Gammacoronavirus and Deltacoronavirus. These viruses infect mammals and birds causing diseases of the respiratory tract, gastrointestinal tract, liver, kidneys, and nervous system while there...

Introduction of Normal Flora Flora meaning from Cambridge  English Dictionary:-In the normal, healthy person the gut flora is a balanced community of different organisms. Normal flora refers to the population of microorganisms that inhabit the skin and mucous membranes of a normal body. A healthy fetus in-utero is free from microorganisms. During birth, the infant is exposed to vaginal flora. Within few hours of birth, oral and nasopharyngeal flora develops, and in a day or two...

Introduction of DNase test DNase test is useful for presumptive identification of Staphylococcus aureus which produces the enzyme deoxyribonuclease from other Staphylococci which do not produce DNase. This test is also positive in the following organisms like Aeromonas spp., Vibrio cholerae Stenotrophomonas maltophilia, Moraxella catarrhalis, and  Serratia spp. except for Serratia fonticola. Composition of Dnase Test agar with Toluidine Blue (Hardy Diagnostics formulation) Ingredients         Gram weight per liter LPancreatic Digest of Casein: 15.0gm Papaic Digest of...