Bordetella pertussis- An Overview

Bordetella pertussis

What is Bordetella pertussis? Bordetella pertussis is a pathogenic Gram-negative aerobic bacterium that is the causative agent of the disease pertussis or whooping cough. B. pertussis is the type species of Bordetella that consists of minute mesophilic coccobacillus that facilitates … Read more

Lactobacillus acidophilus- An Overview

Lactobacillus acidophilus

What is Lactobacillus acidophilus? Lactobacillus is a taxonomically diverse group of Gram-positive, non-sporing rods that are defined by the formation of lactic acid as the sole end product of carbohydrate metabolism. Lactobacillus acidophilus is one of the most important species … Read more

Pseudomonas aeruginosa- An Overview

Pseudomonas aeruginosa

What is Pseudomonas aeruginosa? Pseudomonas aeruginosa is an aerobic microorganism that is a motile, Gram-negative rod-shaped bacteria distributed throughout different habitats in the world. It has an absolute aerobic metabolism and thus, gives a positive oxidase reaction. P. aeruginosa is … Read more

Bacillus anthracis- An Overview

Bacillus anthracis

Bacillus anthracis definition Bacillus anthracis is the only obligate pathogenic species of Bacillus and the causative agent of anthrax, which is a common disease of livestock and occasionally occurs in humans. Anthrax is called a zoonotic disease as the disease … Read more

Streptococcus mutans- An Overview

Streptococcus mutans

What is Streptococcus mutans? Streptococcus mutans is a Gram-positive coccus that is a major inhabitant of the oral cavity and is considered a significant contributor of tooth decay and cavities. Streptococci are spherical or ovoid cells, arranged in chains or … Read more

Streptococcus mitis- An Overview

Streptococcus mitis

What is Streptococcus mitis? Streptococcus mitis is a Gram-positive coccus belonging to the viridians group of Streptococci as well as the mitis group. It is a commensal organism that colonizes different areas of the human body like the oropharynx, skin, … Read more

Staphylococcus saprophyticus- An Overview

Staphylococcus saprophyticus

What is Staphylococcus saprophyticus? Staphylococcus saprophyticus is a Gram-positive, coagulase-negative coccus that is an important part of the group of microorganisms causing urinary tract infections (UTIs), particularly in young sexually active females. Like all Staphylococci, S. saprophyticus is also clustering … Read more

Streptococcus anginosus- An Overview

Streptococcus anginosus

What is Streptococcus anginosus? Streptococcus anginosus is a Gram-positive bacterium that is present in the mouth, upper respiratory tract, gastrointestinal tract, and vagina as a normal inhabitant. S. anginosus belongs to the anginosus subgroup of viridans streptococci which was traditionally … Read more

Staphylococcus aureus- An Overview

Staphylococcus aureus

Image Source: ASM and Bacteria in Photos. Habitat of Staphylococcus aureus The natural habitat is mammalian body surfaces. They are normal flora of the skin and mucous membrane. Also present in the nose / the anterior nares. They can also be … Read more

Mycobacterium tuberculosis- An Overview

Mycobacterium tuberculosis

Habitat of Mycobacterium tuberculosis Human is only a known reservoir. Usually found in the lungs but can also live in any part of the body. They may be obligate pathogen, facultative or opportunistic pathogens, or free living. Usually infect the … Read more

Escherichia coli (E. coli)- An Overview

Habitat of E. coli

Habitat of E. coli E. coli was discovered by Theodor Escherich in 1885 after isolating it from the feces of newborns. E. coli is the normal flora of the human body. The niche of E. coli depends upon the availability of … Read more

Clostridium perfringens- An Overview

Clostridium perfringens

Image Source: Nanobugs. Habitat of Clostridium perfringens Clostridium perfringens are isolated from fecal specimens from humans and animals. They are an inhabitant of human normal intestinal flora. They are present in nature and can be found as a normal component … Read more

Bacillus cereus- An Overview

Bacillus cereus

Habitat of Bacillus cereus Bacillus cereus is isolated from soil, vegetables, milk, cereals, spices, fried rice, cooked poultry and meats, soups, and desserts. It is also found in mashed potatoes, beef stew, apples, hot chocolates sold in vending machines, and … Read more

Staphylococcus lugdunensis- An Overview

Staphylococcus lugdunensis

What is Staphylococcus lugdunensis? Staphylococcus lugdunensis is a Gram-positive, coagulase-negative coccus that is a part of human normal flora but recently has been associated with various skin and soft tissue infections. S. lugdunensis has a significant pathogenic potential compared with … Read more

Streptococcus bovis- An Overview

Streptococcus bovis

What is Streptococcus bovis? Streptococcus bovis is a Gram-positive bacterium that belongs to the bovis/equinus complex of the viridans Streptococci. It is present in the gastrointestinal tract of humans as a normal inhabitant, along with other Streptococcus species. However, it … Read more

Staphylococcus hominis- An Overview

Staphylococcus hominis

What is Staphylococcus hominis? Staphylococcus hominis is a Gram-positive coagulase-negative member of Staphylococci that exists as a commensal on the human body, especially in the areas with apocrine glands, axillae, and the pubic region. Like most other coagulase-negative Staphylococci, S. … Read more

Streptococcus agalactiae- An Overview

Streptococcus agalactiae

What is Streptococcus agalactiae? Streptococcus agalactiae is a Gram-positive, non-motile, non-spore-forming coccus that is the only member of the Group B of the Lancefield antigen grouping. It is a β-hemolytic, catalase-negative, facultative anaerobe that consists of ten different serotypes, separated … Read more

Staphylococcus capitis- An Overview

Staphylococcus capitis

What is Staphylococcus capitis? Staphylococcus capitis is a Gram-positive, coagulase-negative coccus, present as a part of the human normal flora mostly localized in areas around the scalp and face that have been lately associated with bacteria in neonates. Staphylococcus capitis … Read more

Staphylococcus epidermidis- An Overview

Staphylococcus epidermidis - An Overview

What is Staphylococcus epidermidis? Staphylococcus epidermidis is a Gram-positive bacterium belonging to the genus Staphylococcus and is the most frequently isolated species from human epithelia. Staphylococci are known as clustering Gram-positive cocci, nonmotile, non-spore-forming facultatively anaerobic that classified into two … Read more

Enterobacteriaceae Cultural Characteristics

Enterobacteriaceae Cultural Characteristics

Image Source: Cole-Parmer Instrument Company. Cultural Characteristics of Citrobacter freundii Citrobacter freundii on Nutrient Agar Smooth, convex, translucent, or opaque grey colored with a shiny surface and entire margin; mucoid or rough colonies occasionally. Citrobacter freundii on Blood Agar Circular, … Read more