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Introduction of Haemophilus The genus Haemophilus is a pleomorphic Gram-negative coccobacilli fastidious bacteria and thus they do not grow on an ordinary medium like nutrient agar and they need chocolate agar to grow (H. influenzae) due to having X, V, and both X and V growth factors in it. …
Definition of Dermatophytes Dermatophytes are a common label for a group of three types of keratinophilic fungi that infect keratinized tissues causing diseases known as dermatophytoses and they are Trichophyton, Microsporum, and Epidermophyton that commonly cause skin, nail, and hair disease in our body. Differences among Trichophyton, Microsporum, and Epidermophyton The …
Introduction of Staphylococcus and Micrococcus Staphylococcus (pleural-staphylococci) is spherical, non-motile, gram-positive in singles, pairs, and clusters. On nutrient agar, growth is opaque and golden yellow or white color. Catalase and coagulase test positive (Staphylococcus aureus), oxidase negative, aerobic or facultative anaerobe. Parasite of humans and …
Introduction of Streptococcus pneumoniae and Viridans streptococci Streptococcus pneumoniae is also called pneumococcus and pneumococcus is the commensals of the upper respiratory tract. It is an important etiological agent of pneumonia and otitis media in children that differs from streptococci in its morphology (diplococci), bile …
Introduction of Amoebic dysentery and Bacillary dysentery Amoebic dysentery or amoebiasis is an intestinal infection caused by a unicellular (protozoan) parasite, Entamoeba histolytica whereas bacillary dysentery or shigellosis is a bacterial disease caused by a group of non-motile bacteria called Shigella species. Differences between Amoebic …
Introduction of Wright’s stain Wright’s stain is also called a hematologic stain and it is one of the Romanowsky stains, which is commonly applied in clinical hematology laboratory for the routine staining of the peripheral blood smear (PBS) as well as staining bone marrow aspirates, urine specimens …
Introduction of Sabouraud Dextrose Agar (SDA) Sabouraud Dextrose Agar (SDA) is a common fungal culture medium and Sabouraud is the surname of creator Raymond Jacques Adrien Sabouraud a French physician born in Nantes. He formulated SDA in 1892 for culturing dermatophytes. SDA is the most common …
History and Introduction of Mueller-Hinton Agar (MHA) The name Mueller- Hinton agar(MHA) is from the surname of co-developers microbiologist John Howard Mueller and veterinary scientist Jane Hilton at Harvard University as a culture for gonococcus and meningococcus, who published the method in 1941. It is a non-selective and non-differential …