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Abscess Culture – Diagnosis and Significance

An abscess culture is a microbiological examination of pus from an abscess, used to identify disease-causing bacteria and determine the most appropriate antibiotic treatment.

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Things worth knowing about "Abscess Culture"

An abscess culture is a microbiological examination of pus from an abscess, used to identify disease-causing bacteria and determine the most appropriate antibiotic treatment.

What Is an Abscess Culture?

An abscess culture is a laboratory diagnostic procedure in which a sample of pus or secretion from an abscess is collected and examined in the laboratory for microorganisms. The primary goal is to identify the causative pathogens – usually bacteria – and to test their sensitivity to antibiotics. This antibiotic sensitivity testing is known as an antibiogram and is essential for selecting the most effective treatment.

What Is an Abscess?

An abscess is a localized collection of pus within tissue, caused by a bacterial infection. The body attempts to contain the infection by forming a fibrous capsule around it. Abscesses can develop almost anywhere in the body. Common locations include:

Skin and subcutaneous tissue (e.g., furuncles, carbuncles)
Gums and jaw (dental abscesses)
Internal organs (e.g., liver abscess, lung abscess)
Anorectal region (perianal abscess)

How Is an Abscess Culture Performed?

Sample Collection

The sample is typically collected during the surgical incision and drainage of the abscess. Pus is aspirated using a sterile syringe or collected with a swab. For deep-seated abscesses, ultrasound-guided aspiration may be required. Strict sterile technique is essential to prevent contamination of the sample.

Laboratory Analysis

In the microbiology laboratory, the sample is applied to specialized culture media and incubated under appropriate conditions. After 24 to 72 hours, bacterial colonies that have grown can be identified and tested for antibiotic susceptibility. In addition to bacteria, fungi or, in rare cases, mycobacteria (e.g., in tuberculosis) may also be detected.

Which Pathogens Are Commonly Found?

The most frequently identified pathogens in an abscess culture include:

Staphylococcus aureus (including MRSA) – the most common cause of skin abscesses
Streptococci – various species depending on the location
Escherichia coli and other Enterobacteriaceae – especially in abdominal abscesses
Anaerobes (e.g., Bacteroides spp.) – common in deep or abdominal abscesses
Candida species – particularly in immunocompromised patients

When Is an Abscess Culture Ordered?

An abscess culture is recommended in the following situations:

Large or deep abscesses requiring surgical drainage
Abscesses in immunocompromised individuals (e.g., diabetics, HIV patients)
Suspected resistant pathogens (e.g., MRSA)
Failure to respond to empirical antibiotic therapy
Recurrent abscesses
Abscesses following surgery or invasive procedures

Interpretation of Results and Clinical Significance

The results of an abscess culture include pathogen identification and an antibiogram, which indicates whether the identified organism is susceptible, intermediate, or resistant to specific antibiotics. Based on these findings, the treating physician can tailor the antibiotic therapy accordingly, improving the chances of recovery and helping to prevent the development of antibiotic resistance.

Treatment of Abscesses

The treatment of an abscess generally involves two key components:

Surgical drainage: Incision and evacuation of the abscess – this is the primary and often sole treatment required for uncomplicated skin abscesses.
Antibiotic therapy: Used for extensive, deep, or complicated abscesses, and when signs of systemic infection are present (fever, elevated inflammatory markers). The choice of antibiotic is guided by the results of the abscess culture.

References

World Health Organization (WHO): Antimicrobial Resistance – Global Action Plan. www.who.int
Kasper DL et al.: Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill Education, 2022.
Stevens DL et al.: Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections. Clinical Infectious Diseases, 2014. doi:10.1093/cid/ciu296

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