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Bacteriology

Bacteriology is a branch or discipline of science that studies different characteristics of bacteria and their association with other organisms or disciplines.

  • Over the years, the discipline of bacteriology has evolved from the microbiological tests performed only by physicians, the application of the germ theory of disease and economic concerns relating to the spoilage of foods and wine to the use of bacteria to simpler forms of laboratory tests and the production of new nutritious food and antibiotics.
  • The study of bacteria began with the discovery of the microscope and was mostly limited to experts and scientists of that time.
  • The initial advances in pathogenic bacteriology began with the identification and characterization of bacteria associated with specific diseases.
  • Nowadays, however, bacteriology is used in various other fields like food, pharmaceuticals, agriculture, and the environment.
  • Significant advances made in bacteriology over the last century have resulted in the development of many useful vaccines like pneumococcal polysaccharide vaccine, diphtheria toxoid as well as antibiotics.
  • At present, most bacterial diseases in humans and their infectious agents have been identified, although significant variants continue to evolve and sometimes emerge.
  • Studies made in bacteriology have also allowed the use of gene recombination technology in bacteria to produce improved bacterial strains that can then be used in various areas.
  • The importance of bacteriology continues to grow throughout the years as many diseases and disorders associated with almost all living beings are caused by bacteria.
  • Studies of non-pathogenic bacteria that exist in a symbiotic relationship with plants and animals are even beneficial to said organisms.
  • The identification and classification of bacteria into different groups have allowed for a convenient way of studying these bacteria and the formation of a separate branch, systemic bacteriology, that deals with taxonomy.
  • Besides, bacteriological studies, subsequently, have also been divided into different areas like soil bacteriology, public-health bacteriology, industrial bacteriology, etc.
  • Bacteriological studies have been the focal point for disease diagnosis and treatment, and their importance continues to grow with the emergence of new bacteria and associated diseases.

Enteropathogenic E. coli (EPEC): Characteristics, Virulence, Diarrhea & Diagnosis

September 26, 2026January 25, 2022 by Sagar Aryal, PhD
Enteropathogenic Escherichia coli (EPEC)

Two groups of E. coli are responsible for enteric disease: Enteropathogenic E. coli [EPEC] and some Shiga toxin–producing E. coli [STEC]. They both possess a cluster of virulence genes located … Read more

Pathogenesis and Clinical manifestations of Treponema pallidum

September 5, 2022January 23, 2022 by Sagar Aryal, PhD
Pathogenesis and Clinical manifestations of Treponema pallidum

Pathogenesis of Treponema pallidum The two major routes of transmission of Treponema pallidum are sexual and transplacental. Sexual exposure to a person who has an active syphilitic chancre carries a … Read more

Laboratory Diagnosis, Treatment and Prevention of Shigella dysenteriae

September 5, 2022January 18, 2022 by Sagar Aryal, PhD
Laboratory Diagnosis, Treatment and Prevention of Shigella dysenteriae

Specimens: stool, mucus flecks, and rectal swabs for culture. Large numbers of fecal leukocytes and some red blood cells often are seen microscopically. Microscopic examination Microscopic examination of stool smears … Read more

Virulence factors, Pathogenesis and Clinical manifestations of Legionella pneumophila

September 5, 2022January 15, 2022 by Sagar Aryal, PhD
 Virulence factors, Pathogenesis and Clinical manifestations of Legionella pneumophila

 Virulence factors of Legionella pneumophila Heat shock protein 60: enhances invasion and cytokine expression in macrophages. Outer membrane protein: binding with and delivery of packaged materials into the eukaryotic cells. inhibit … Read more

Corynebacterium diphtheriae: Morphology, Characteristics, Diphtheria & Diagnosis

September 26, 2026January 15, 2022 by Sagar Aryal, PhD
Corynebacterium diphtheriae

Habitat of Corynebacterium diphtheriae Corynebacterium diphtheriae is found in nasopharynx as well as in skin lesions, which actually represent a reservoir for the spread of diphtheria. Also found in mouth, throat, … Read more

Staphylococcus vs Streptococcus- 20 Major Differences

January 26, 2022January 14, 2022 by Sagar Aryal, PhD
Staphylococcus and Streptococcus Differences

Staphylococcus and Streptococcus are Gram-positive and the two most common pathogenic cocci of medical importance. They are both non-motile, non-sporing, and facultative anaerobes which can be differentiated on the following grounds: S.N. … Read more

Streptococcus mutans: Morphology, Characteristics, Dental Caries & Virulence

September 26, 2026January 13, 2022 by Anupama Sapkota
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 … Read more

E. coli Pathotypes- ETEC, EPEC, EHEC, EAEC, EIEC, DAEC

January 13, 2023January 12, 2022 by Sagar Aryal, PhD
E. coli Pathotypes

Escherichia coli as Pathogens The effectiveness of E. coli as a pathogen is illustrated by the fact that: Pathotypes of E. coli Source: DOI: 10.1128/CMR.00022-13 A. Enterotoxigenic E. coli (ETEC) B. … Read more

Chlamydia trachomatis: Characteristics, Infections, Transmission & Diagnosis

September 26, 2026January 11, 2022 by Sagar Aryal, PhD
Chlamydia trachomatis

Habitat of Chlamydia trachomatis It is an obligate intracellular human pathogens. Humans are the only natural host. It cannot survive outside of a eukaryotic host. Chlamydia trachomatis is transmitted by … Read more

Salmonellosis- Food Infection and Food Poisoning by Salmonella

January 9, 2022 by Sushmita Dura
Salmonellosis- Food Infection and Food Poisoning by Salmonella

What is Salmonella? Salmonella is one of the major food-borne pathogens that cause systemic or enteric infection affecting approximately 2 million people worldwide each year. The first organism, Salmonella choleraesuis … Read more

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