Related Experiment Videos
Bacterial isolates from necrotizing fasciitis: a clinico-pathological perspective.
1Department of Surgery, Usmanu Danfodiyo University Teaching Hospital, Nigeria. legboj@yahoo.co.uk
Summary
Necrotizing fasciitis (NF) is a severe polymicrobial infection. Staphylococcus aureus and Pseudomonas aeruginosa were common culprits in Nigeria, highlighting the need for ongoing antibiotic sensitivity monitoring.
Area of Science:
- Infectious Diseases
- Microbiology
- Surgery
Background:
- Necrotizing fasciitis (NF) is a life-threatening, rapidly progressing soft tissue infection.
- It is polymicrobial and can affect any body part in any individual.
- Prompt identification of causative agents is crucial for effective treatment.
Purpose of the Study:
- To identify the spectrum of aerobic bacteria causing NF in Sokoto, Nigeria.
- To establish a local baseline for future research and treatment strategies.
Main Methods:
- A 5-year prospective study (2001-2005) of aerobic bacteria in NF patients.
- Aerobic cultures were performed on samples from affected patients.
- Clinical data was collected and analyzed.
Main Results:
- 62 patients (53.2% male) were studied, with a mean age of 21.4 years.
- Staphylococcus aureus and Pseudomonas aeruginosa were the most frequent isolates.
- Polymicrobial infections occurred in 64% of cases, with cephalosporins, quinolones, and aminoglycosides showing good sensitivity.
Conclusions:
- Necrotizing fasciitis is predominantly polymicrobial, involving both Gram-positive and Gram-negative bacteria.
- Regular assessment of microbial characteristics and antibiotic sensitivities is essential for optimal patient management.
Related Concept Videos
01:16Cellular Injury IV: Necrosis
Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
01:20Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
01:12Bacterial Toxins
Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
01:29Staphylococcal Skin Infections
Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
01:26Bacterial Meningitis II: Pathophysiology
Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
01:22Bacterial Meningitis I: Introduction
Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...