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Staphylococci: Infections, Symptoms and Treatment
Staphylococci are spherical bacteria commonly found on skin and mucous membranes. They can be harmless or cause serious infections depending on circumstances.
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Staphylococci are spherical bacteria commonly found on skin and mucous membranes. They can be harmless or cause serious infections depending on circumstances.
What are Staphylococci?
Staphylococci (genus: Staphylococcus) are spherical, gram-positive bacteria that cluster together in grape-like formations. They are part of the normal human bacterial flora, commonly colonizing the skin, nasal passages, and mucous membranes without causing disease. However, under certain conditions – such as a weakened immune system or a breach in the skin barrier – they can cause serious infections.
Types of Staphylococci
There are more than 40 known species of staphylococci. The most medically significant include:
- Staphylococcus aureus: The most common disease-causing species. It can cause a wide range of infections, from minor skin conditions to life-threatening illnesses such as sepsis and pneumonia.
- Staphylococcus epidermidis: Commonly found on the skin; harmless in healthy individuals but can cause infections in immunocompromised patients or via medical devices such as catheters.
- Staphylococcus saprophyticus: A common cause of urinary tract infections, particularly in young women.
Causes and Transmission
Staphylococci are primarily transmitted through direct contact. Common routes of transmission include:
- Direct skin-to-skin contact with an infected person
- Contact with contaminated surfaces or objects
- Respiratory droplets
- Contaminated food (staphylococcal enterotoxins)
- Medical procedures, catheters, or implants (hospital-acquired infections)
Symptoms
The symptoms of a staphylococcal infection depend greatly on the affected area of the body:
- Skin and soft tissue: Boils, carbuncles, abscesses, wound infections, impetigo, and Staphylococcal Scalded Skin Syndrome (SSSS)
- Respiratory tract: Pneumonia, particularly as a complication following viral infections such as influenza
- Bloodstream infection (sepsis): High fever, chills, and circulatory failure – a medical emergency
- Infective endocarditis: Inflammation of the inner lining of the heart, often associated with intravenous drug use or cardiac surgery
- Food poisoning: Nausea, vomiting, and diarrhea – typically occurring within 1 to 6 hours of consuming contaminated food
- Urinary tract infections: Burning sensation during urination, frequent urge to urinate
Diagnosis
Diagnosis of a staphylococcal infection is made through:
- Microbiological cultures: Swab, blood, urine, or wound cultures to identify the causative organism
- Antibiogram (susceptibility testing): Testing the pathogen for antibiotic resistance – particularly important for detecting MRSA (Methicillin-resistant Staphylococcus aureus)
- Imaging: Ultrasound, CT, or MRI for deep tissue infections or endocarditis
- Echocardiography: Cardiac ultrasound when endocarditis is suspected
Treatment
Treatment depends on the type and severity of the infection as well as the resistance profile of the pathogen:
- Antibiotics: For susceptible Staphylococcus aureus strains, penicillinase-resistant penicillins (e.g., flucloxacillin) or cephalosporins are used. For MRSA, reserve antibiotics such as vancomycin or linezolid are required.
- Surgical drainage: Abscesses often need to be surgically incised and drained, as antibiotics alone are frequently insufficient.
- Removal of foreign bodies: Infected catheters, implants, or pacemakers may need to be removed.
- Supportive care: Severe infections such as sepsis require intensive care management.
MRSA – Methicillin-Resistant Staphylococcus aureus
MRSA is a particularly dangerous form of Staphylococcus aureus that is resistant to most conventional antibiotics. MRSA infections occur frequently in hospitals (hospital-acquired MRSA, HA-MRSA) and in the wider community (community-acquired MRSA, CA-MRSA). Hygiene measures such as regular handwashing, disinfection, and isolation protocols for affected patients are essential to contain its spread.
Prevention
The following measures are recommended to prevent staphylococcal infections:
- Regular and thorough handwashing
- Proper cleaning and covering of wounds
- Avoiding sharing towels, razors, or other personal items
- Adherence to hygiene standards in hospitals and care facilities
- Safe food preparation and storage practices
References
- Robert Koch Institute (RKI): Staphylococci – Infectious Diseases A-Z. www.rki.de (2023)
- Lowy, F.D.: Staphylococcus aureus infections. New England Journal of Medicine, 339(8):520-532 (1998)
- Tong, S.Y.C. et al.: Staphylococcus aureus infections: epidemiology, pathophysiology, clinical manifestations, and management. Clinical Microbiology Reviews, 28(3):603-661 (2015)
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