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IBEX Sciences Culture Check TSB Aerobic Solution (Culture Bottle) is a specialized, ready-to-use blood culture bottle utilized in clinical microbiology for the isolation and cultivation of aerobic bacteria and fungi from whole blood or other sterile body fluids. [1, 2]
Manufactured by IBEX Sciences, this device serves as a primary tool for diagnosing septicemia, bacteremia, and systemic fungal infections.
Core Medium & Principles
The solution inside the bottle is Tryptic Soy Broth (TSB), also known as Soybean-Casein Digest Medium. [1]
- Nutritional Base: Formulated with pancreatic digest of casein and papaic digest of soybean, it supplies amino acids, vitamins, and essential growth factors needed to sustain both robust and fastidious microorganisms. [1, 2]
- Carbohydrate Source: Contains glucose (dextrose) to serve as an energy substrate for rapid bacterial metabolism. [1, 2]
- Anticoagulation & Neutralization: Blood culture formulations typically include Sodium Polyanethol Sulfonate (SPS). SPS acts as an anticoagulant to prevent the blood from clotting within the bottle. It also inactivates natural bactericidal properties of the blood (such as complement and phagocytes) and neutralizes certain aminoglycoside antibiotics that might delay microbial growth. [1, 2, 3]
Aerobic Versus Anaerobic Processing
This specific bottle is explicitly labeled for Aerobic Solution cultivation.
- Target Pathogens: Optimized for oxygen-requiring pathogens such as Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli, and yeast species like Candida albicans. [1]
- Venting Requirement: Unlike anaerobic culture bottles which must remain tightly sealed from atmospheric air, aerobic culture bottles often require a sterile venting needle. After inoculating the patient’s blood sample through the rubber septum, a venting needle with a built-in filter is inserted into the top of the bottle to introduce ambient oxygen while maintaining a sterile boundary. [1]
Standard Diagnostic Workflow
- Preparation: Do not unscrew the main cap. Remove the plastic flip-cap from the top and thoroughly disinfect the exposed rubber septum using a fresh 70% isopropyl alcohol swab; allow it to air dry.
- Inoculation: Collect the patient’s blood sample using strict aseptic venipuncture techniques. Immediately inject a precise micro-volume (typically 5–10 mL for adults or 1–3 mL for pediatric variants) straight through the rubber stopper into the medium using the syringe needle.
- Venting and Mixing: If manual protocol demands, insert a sterile venting needle into the stopper. Gently invert the culture bottle 2 to 3 times to completely mix the blood sample with the TSB broth.
- Incubation: Place the bottle inside a dedicated laboratory incubator at 35°C ± 2°C. Standard diagnostic protocols dictate monitoring the bottle for 5 to 7 days before reporting a final negative result. [1, 2, 3]
Interpreting Visual Signs of Growth (Positive Culture)
During daily examinations, the bottle should be checked for distinct visual endpoints indicating microbial metabolism:
- Turbidity: The clear, light-amber TSB broth turns cloudier or opaque over time.
- Gas Production: Visible bubbles or a buildup of pressure under the cap caused by carbon dioxide (CO₂) accumulation.
- Hemolysis: Severe discoloration or breakdown of the red blood cells, indicating hemolytic bacterial species (such as Streptococcus pneumoniae or Staphylococcus aureus).
- Microbial Colonies: Visible puff-balls or granular sediment settled at the bottom layer of the blood matrix. [1, 2]
Note: If any visual signs of growth appear, the laboratory technician must immediately perform a Gram stain and subculture the broth onto agar plates for precise pathogen identification and antimicrobial susceptibility testing (AST). [1]
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