Skin and soft tissue infection: microbiology and epidemiology

Matthew S Dryden1

  • 1Microbiology and Communicable Disease, Royal Hampshire County Hospital, Winchester SO225DG, UK. matthew.dryden@wehct.nhs.uk

Insights

Skin and soft tissue infections (SSTIs) are common bacterial infections. Emerging community-acquired methicillin-resistant Staphylococcus aureus (MRSA) strains present unique challenges and require careful consideration of patient factors.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Epidemiology

Background:

  • Skin and soft tissue infections (SSTIs) represent a spectrum of conditions, from minor to life-threatening.
  • Classification can be based on site, severity, or microbial cause, often categorized as complicated or uncomplicated.
  • Community-acquired SSTIs are typically caused by staphylococci or streptococci, but other pathogens can be involved.

Purpose of the Study:

  • To review the epidemiology and characteristics of skin and soft tissue infections.
  • To highlight the increasing prevalence of community-acquired methicillin-resistant Staphylococcus aureus (MRSA).
  • To discuss factors influencing the microbial etiology of SSTIs.

Main Methods:

  • Literature review of epidemiological trends in SSTIs.
  • Analysis of microbial causes, including common and emerging pathogens.
  • Identification of risk factors associated with SSTI development.

Main Results:

  • Staphylococci and streptococci are the most frequent causes of community-acquired SSTIs.
  • A rise in both healthcare-associated and community-acquired MRSA has been observed.
  • Community-acquired MRSA strains may possess distinct exotoxin profiles compared to healthcare-associated strains.

Conclusions:

  • SSTIs are a significant public health concern with evolving etiological patterns.
  • The increasing incidence of community-acquired MRSA necessitates updated diagnostic and treatment strategies.
  • Patient-specific factors, including underlying conditions and exposures, play a crucial role in SSTI causation.

Related Concept Videos

Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
The Skin Microbiota01:27

The Skin Microbiota

The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
Staphylococcal Skin Infections01:29

Staphylococcal 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...
Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
Acne Infection01:27

Acne Infection

Acne is a multifactorial skin condition primarily affecting adolescents and young adults, with a global prevalence estimated to exceed 75% in this demographic. The condition is characterized by the formation of comedones (blackheads and whiteheads), papules, pustules, nodules, and, in severe cases, cysts, particularly in areas rich in sebaceous glands such as the face, neck, chest, and back. The pathogenesis involves increased sebum production, follicular hyperkeratinization, colonization by...