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  • Bacteriology
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  • Epidemiology
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  • Research, Proposal & Scholarships
    • How to create your EUROPASS CV and cover letter for EU applications (jobs, research positions, education)
    • How to write a Cover Letter – Faculty, Postgraduate, Postdoc – sample attached
    • Research proposal tips for grants & projects
    • Sample template on how to write your research achievements and results when applying for a fellowship or grant
    • Access to scholarship and funding opportunities for conferences, study (B.Sc., M.Sc., Ph.D.), postdoctoral fellowships and research grants
    • Steps for a Successful Post-Doctoral Fellowship Application, Grant Call or Scholarships for Postgraduate Studies Abroad – A Personal Memoir 
    • Current Calls & Scholarship Opportunities for Training, Postdoc, Higher Education, Postgraduate Studies & Jobs
    • The Proposal Writer’s Guide
    • Common Mistakes International Students Make in Scholarship Applications
    • Important Microbiology Websites for Study & Opportunities
  • Virology

Author: Dr. Chika Ejikeugwu

Dr. Chika Ejikeugwu is a Microbiologist, Researcher, and Educator with an extensive international profile. He was a Fellow of the Alexander von Humboldt (AvH) Foundation, Germany from 2023-2026. Currently, he serves as a Research Fellow at the Department of Microbiology, Brandenburg University of Technology (BTU) Cottbus-Senftenberg, Germany. His research focuses on antimicrobial resistance (AMR) and the ecological impacts of antibiotics, with particular emphasis on soil ecosystems. He is the founder and developer of Africa’s leading microbiology platform, www.MicrobiologyClass.net, a widely recognized knowledge hub that supports students, professionals, and researchers across Africa and beyond. The platform is a key resource for advancing microbiology education and research with global reach and relevance. Throughout his career, Dr. Ejikeugwu has held several prestigious international research appointments and fellowships, including a Research Fellowship at the Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany, within the soilRESIST project, where he investigated the effects of antibiotic mixtures on soil microbiomes. He has also completed postdoctoral fellowships at the Federal Institute for Materials Research and Testing (BAM), Berlin, Germany, under the DAAD program, and at Kyoto University, Kyoto, Japan, under the MIF fellowship scheme. In recognition of his contributions to AMR research, he received the Young Investigator Award on AMR from Institut Mérieux, France, in 2021. He is also a recipient of the NIH CAMRA grant supporting research on AMR in poultry environments. Dr. Ejikeugwu was a member of the Global Young Academy (GYA), Germany, and holds memberships in several professional organizations, including Applied Microbiology International (AMI), the European Society of Clinical Microbiology and Infectious Diseases (ESCMID), the American Society for Microbiology (ASM), and the Nigerian Society for Microbiology (NSM). He earned his PhD. in Pharmaceutical Microbiology and Biotechnology in 2017 from Nnamdi Azikiwe University, Nigeria. In his current role as Reader at ESUT, Nigeria, he is deeply engaged in teaching, mentorship, and research leadership. He supervises undergraduate and postgraduate students, fostering academic development and strengthening capacity in microbiology and AMR research. Driven by a sustained commitment to scientific excellence, education, and international collaboration, Dr. Ejikeugwu continues to contribute significantly to the advancement of microbiology and AMR research worldwide.
  • Home
  • Dr. Chika Ejikeugwu
  • Page 5
STREAKING TECHNIQUE
  • Bacteriology
  • Microbe Lab
  • Techniques in Microbiology Lab

STREAKING TECHNIQUE

  • Dr. Chika Ejikeugwu
  • April 25, 2023

Streaking is a microbiological technique that is used to obtain pure cultures of microorganisms (particularly […]

ISOLATION TECHNIQUE
  • Microbe Lab
  • Techniques in Microbiology Lab

ISOLATION TECHNIQUE

  • Dr. Chika Ejikeugwu
  • April 25, 2023

Isolation technique is a microbiology procedure which is used to obtain pure cultures of microorganisms […]

MANTOUX (TUBERCULIN) TEST
  • Biochemical Tests in Microbiology Lab
  • Immunology & Immune System

MANTOUX (TUBERCULIN) TEST

  • Dr. Chika Ejikeugwu
  • April 17, 2023

Mantoux (Tuberculin) Test is used as a laboratory diagnostic aid to detect reactions of individuals […]

MYCOBACTERIUM TUBERCULOSIS
  • Bacteriology

MYCOBACTERIUM TUBERCULOSIS

  • Dr. Chika Ejikeugwu
  • April 17, 2023

Mycobacterium tuberculosis is a slim, non-motile, non-spore forming, Gram-positive, obligate aerobe, and acid-fast bacillus (rod) […]

HAEMOPHILUS INFLUENZAE
  • Bacteriology

HAEMOPHILUS INFLUENZAE

  • Dr. Chika Ejikeugwu
  • April 17, 2023

Haemophilus influenza is a small, Gram-negative, non-sporulating, non-motile, urease positive, indole positive, pleomorphic, rod-like or […]

Fermentation Media
  • Industrial Microbiology

Fermentation Media

  • Dr. Chika Ejikeugwu
  • April 17, 2023

Fermentation media are the carefully designed nutrient preparations that support the growth, survival, and metabolic […]

The Microbiology of Beer Production
  • Industrial Microbiology

The Microbiology of Beer Production

  • Dr. Chika Ejikeugwu
  • April 17, 2023

Beer is one of the oldest and most widely consumed alcoholic beverages in the world. […]

CARE & MAINTENANCE OF THE MICROSCOPE
  • General Microbiology

CARE & MAINTENANCE OF THE MICROSCOPE

  • Dr. Chika Ejikeugwu
  • April 9, 2023

Microscope is a piece of instrument or equipment used by microbiologists to examine microorganisms and […]

TEST STAGES OF MPN METHOD
  • Environmental & Soil Microbiology

TEST STAGES OF MPN METHOD

  • Dr. Chika Ejikeugwu
  • April 9, 2023

PRESUMPTIVE TEST The presumptive test provides a preliminary estimate of bacterial density present in a […]

MOST PROBABLE NUMBER (MPN) TECHNIQUE
  • Environmental & Soil Microbiology

MOST PROBABLE NUMBER (MPN) TECHNIQUE

  • Dr. Chika Ejikeugwu
  • April 9, 2023

The estimation of the number of microorganisms including bacteria and fungi present in public health […]

GENOTYPIC DETECTION OF ANTIBIOTIC RESISTANT MICROBES
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology
  • Techniques in Microbiology Lab

GENOTYPIC DETECTION OF ANTIBIOTIC RESISTANT MICROBES

  • Dr. Chika Ejikeugwu
  • April 9, 2023

The genotypic detection and characterization of antibiotic resistant genes in pathogenic bacteria is more specific […]

FEATURES OF THE VITEK 2 AUTOMATED COMPACT SYSTEM FOR BACTERIAL IDENTIFICATION AND ANTIMICROBIAL SUSCEPTIBILITY TEST (AST)
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Microbe Lab
  • Pharmaceutical Microbiology
  • Techniques in Microbiology Lab

FEATURES OF THE VITEK 2 AUTOMATED COMPACT SYSTEM FOR BACTERIAL IDENTIFICATION AND ANTIMICROBIAL SUSCEPTIBILITY TEST (AST)

  • Dr. Chika Ejikeugwu
  • April 9, 2023

Helping the physician select the best treatment at a much faster pace based on the […]

SULPHONAMIDES  
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

SULPHONAMIDES  

  • Dr. Chika Ejikeugwu
  • April 9, 2023

  Sulphonamides or sulpha drugs are generally known as folate synthesis inhibitors because they inhibit […]

Tetracyclines
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

Tetracyclines

  • Dr. Chika Ejikeugwu
  • April 9, 2023

Tetracyclines constitute an important class of broad-spectrum antimicrobial agents with extensive applications in clinical medicine. […]

Brief History of Antibiotic Resistance
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

Brief History of Antibiotic Resistance

  • Dr. Chika Ejikeugwu
  • March 27, 2023

Antibiotic (antimicrobial) resistance is one of the most significant challenges confronting modern medicine. It occurs […]

PCR TECHNIQUE
  • Biotechnology
  • Molecular Microbiology
  • Techniques in Microbiology Lab

PCR TECHNIQUE

  • Dr. Chika Ejikeugwu
  • March 24, 2023

PCR is the acronym for “polymerase chain reaction”. Polymerase chain reaction is the molecular biology […]

ENZYMES USED IN MOLECULAR BIOLOGY TECHNIQUES
  • Biotechnology
  • Molecular Microbiology
  • Techniques in Microbiology Lab

ENZYMES USED IN MOLECULAR BIOLOGY TECHNIQUES

  • Dr. Chika Ejikeugwu
  • March 24, 2023

Restriction endonucleases are DNA cutting enzymes specifically found and isolated from bacteria; and which nick […]

TERMINOLOGIES USED IN PLASMODIUM INFECTION
  • Public Health & Parasitology

TERMINOLOGIES USED IN PLASMODIUM INFECTION

  • Dr. Chika Ejikeugwu
  • March 14, 2023

References Aschengrau A and Seage G.R (2013). Essentials of Epidemiology in Public Health. Third edition. […]

LIFE CYCLE OF MOSQUITO
  • Public Health & Parasitology

LIFE CYCLE OF MOSQUITO

  • Dr. Chika Ejikeugwu
  • March 14, 2023

Mosquito species including those of Anopheles carry out effective breeding and survival in freshwaters (i.e. […]

HUMAN PLASMODIUM SPECIES: causative agents of malaria
  • Public Health & Parasitology

HUMAN PLASMODIUM SPECIES: causative agents of malaria

  • Dr. Chika Ejikeugwu
  • March 14, 2023

Malaria in humans is majorly caused by four (4) species of Plasmodium. Plasmodium species are […]

Sterile and Non-Sterile Pharmaceutical Products
  • Pharmaceutical Microbiology

Sterile and Non-Sterile Pharmaceutical Products

  • Dr. Chika Ejikeugwu
  • March 14, 2023

Pharmaceutical products are designed to prevent, diagnose, manage, or treat disease, and their quality depends […]

TRICHINELLOSIS
  • Public Health & Parasitology

TRICHINELLOSIS

  • Dr. Chika Ejikeugwu
  • March 13, 2023

Trichinellosis or trichinosis is a zoonotic parasitic disease caused by tissue nematodes or roundworms after […]

PARAGONIMIASIS
  • Public Health & Parasitology

PARAGONIMIASIS

  • Dr. Chika Ejikeugwu
  • March 13, 2023

Paragonimiasis or lung-fluke infection is a protozoan lung disease that resembles bacterial tuberculosis in humans; […]

DRACUNCULIASIS
  • Public Health & Parasitology

DRACUNCULIASIS

  • Dr. Chika Ejikeugwu
  • March 13, 2023

Dracunculiasis is a crippling parasitic disease that is caused by a tissue nematode (roundworm) which […]

Control of Antibiotic (Antimicrobial) Resistance
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Control of Antibiotic (Antimicrobial) Resistance

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antibiotic resistance, more broadly referred to as antimicrobial resistance (AMR), has emerged as one of […]

Impact and Cost of Antimicrobial Resistance on Public Health and the Economy
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Impact and Cost of Antimicrobial Resistance on Public Health and the Economy

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antimicrobial resistance (AMR) or antibiotic resistance occurs when microorganisms acquire the capacity to survive exposure […]

Factors that Contribute to Antibiotic (Antimicrobial) Resistance
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Factors that Contribute to Antibiotic (Antimicrobial) Resistance

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antibiotic resistance has emerged as one of the most consequential challenges confronting modern medicine because […]

Mechanisms of Acquiring Resistance by Bacterial / Microbial Pathogens
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Mechanisms of Acquiring Resistance by Bacterial / Microbial Pathogens

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antimicrobial resistance (AMR) is increasingly recognized as a dynamic biological phenomenon in which bacterial and […]

Mechanisms (Modes) of Transfer of Resistance Genes
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Mechanisms (Modes) of Transfer of Resistance Genes

  • Dr. Chika Ejikeugwu
  • March 10, 2023

The emergence and dissemination of antimicrobial resistance (AMR) represent a dynamic biological phenomenon in which […]

Antimicrobial (Antibiotic) Resistance
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

Antimicrobial (Antibiotic) Resistance

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antimicrobial resistance (AMR), particularly antibiotic resistance, has emerged as one of the most consequential challenges […]

Types of Antibiotic Resistance
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Pharmaceutical Microbiology

Types of Antibiotic Resistance

  • Dr. Chika Ejikeugwu
  • March 10, 2023

Antibiotic resistance is not a single phenomenon but a diverse biological process through which bacteria […]

PRECAUTIONS TAKEN TO AVOID CONTAMINATION IN CELL CULTURE
  • Cell Culture Notes

PRECAUTIONS TAKEN TO AVOID CONTAMINATION IN CELL CULTURE

  • Dr. Chika Ejikeugwu
  • March 9, 2023

Contamination is a great enemy in the cell culture laboratory. Thus all aseptic techniques must […]

CELL LINES
  • Cell Culture Notes

CELL LINES

  • Dr. Chika Ejikeugwu
  • March 9, 2023

OVERVIEW OF CELL LINES A cell line is a cell that has undergone mutation and […]

BASIS FOR A SUCCESSFUL CELL CULTURE & AREAS THAT ENCOURAGED CELL CULTURE DEVELOPMENT
  • Cell Culture Notes

BASIS FOR A SUCCESSFUL CELL CULTURE & AREAS THAT ENCOURAGED CELL CULTURE DEVELOPMENT

  • Dr. Chika Ejikeugwu
  • March 9, 2023

Having a cell culture without any form of contamination is paramount in the cell culture […]

CLASSIFICATION/TYPES OF CELL CULTURE
  • Cell Culture Notes

CLASSIFICATION/TYPES OF CELL CULTURE

  • Dr. Chika Ejikeugwu
  • March 9, 2023

In the cell culture laboratory, there are many cell culture techniques that are routinely engaged […]

Chromatic Vancomycin Resistant Enterococci (VRE) Agar
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Culture media
  • Pharmaceutical Microbiology

Chromatic Vancomycin Resistant Enterococci (VRE) Agar

  • Dr. Chika Ejikeugwu
  • March 8, 2023

The increasing prevalence of vancomycin-resistant enterococci (VRE) has created a persistent challenge for clinical microbiology, […]

HERD IMMUNITY
  • Epidemiology
  • Immunology & Immune System

HERD IMMUNITY

  • Dr. Chika Ejikeugwu
  • March 3, 2023

Herd immunity is a group resistance of a population against a particular disease and the […]

The Triangle of Epidemiology (Epidemiological Triad)
  • Epidemiology

The Triangle of Epidemiology (Epidemiological Triad)

  • Dr. Chika Ejikeugwu
  • March 3, 2023

The triangle of epidemiology, also known as the epidemiological triad, is a fundamental model used in epidemiology […]

Experimental Epidemiological Study
  • Epidemiology

Experimental Epidemiological Study

  • Dr. Chika Ejikeugwu
  • March 1, 2023

Experimental epidemiological studies, often referred to as clinical trials, are analytical research designs used to […]

Sources of Cases & Control in an Epidemiological Study
  • Epidemiology

Sources of Cases & Control in an Epidemiological Study

  • Dr. Chika Ejikeugwu
  • March 1, 2023

In epidemiological research, particularly in case-control studies, the selection of cases and controls is one […]

Ecological Studies
  • Epidemiology

Ecological Studies

  • Dr. Chika Ejikeugwu
  • March 1, 2023

Ecological studies are a type of observational epidemiological study in which the unit of analysis […]

Cross-Sectional Study 
  • Epidemiology

Cross-Sectional Study 

  • Dr. Chika Ejikeugwu
  • March 1, 2023

A cross-sectional study is a descriptive observational epidemiological research design used to investigate the prevalence […]

Prospective (Cohort) Studies
  • Epidemiology

Prospective (Cohort) Studies

  • Dr. Chika Ejikeugwu
  • March 1, 2023

Prospective or cohort studies are observational analytical epidemiological investigations in which the starting point is […]

Retrospective (Case-Control) Study
  • Epidemiology

Retrospective (Case-Control) Study

  • Dr. Chika Ejikeugwu
  • March 1, 2023

A retrospective study, commonly referred to as a case-control study, is an observational analytical epidemiological research […]

Case Reports and Case Series
  • Epidemiology

Case Reports and Case Series

  • Dr. Chika Ejikeugwu
  • March 1, 2023

Case reports are epidemiological studies that involve the careful, detailed, and comprehensive description of a […]

Analytical Epidemiological Study
  • Epidemiology

Analytical Epidemiological Study

  • Dr. Chika Ejikeugwu
  • March 1, 2023

Analytical epidemiological study is a more detailed and comprehensive approach to epidemiological investigation than descriptive […]

SPUTUM CULTURE TECHNIQUE
  • Microbe Lab
  • Techniques in Microbiology Lab

SPUTUM CULTURE TECHNIQUE

  • Dr. Chika Ejikeugwu
  • February 27, 2023

Sputum culture is often recommended in the diagnoses of lower respiratory tract infection (e.g. bacterial […]

URINE CULTURE  TECHNIQUE
  • Microbe Lab
  • Techniques in Microbiology Lab

URINE CULTURE  TECHNIQUE

  • Dr. Chika Ejikeugwu
  • February 27, 2023

Urine culture is performed in order to specifically identify organisms that may be causing a […]

BLOOD CULTURE TECHNIQUE
  • Microbe Lab
  • Techniques in Microbiology Lab

BLOOD CULTURE TECHNIQUE

  • Dr. Chika Ejikeugwu
  • February 27, 2023

Blood culture is the most important diagnostic method for detecting and diagnosing bacteraemia (presence of […]

STOOL CULTURE TECHNIQUE
  • Bacteriology
  • Microbe Lab
  • Techniques in Microbiology Lab

STOOL CULTURE TECHNIQUE

  • Dr. Chika Ejikeugwu
  • February 27, 2023

Stool culture is demanded in the bacteriology laboratory as method for detecting and diagnosing enteric […]

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