1. Core Purpose & Functions

VTM solves the inherent fragility of viruses (non-living, sensitive to pH, temperature, drying, and enzymes). Its main roles:

• Prevent desiccation: Keeps samples moist to avoid viral particle breakdown.
• Stabilize pH: Maintains neutral pH (~7.2–7.4) to protect viral structure.
• Inhibit contaminants: Contains antimicrobials to stop bacteria/fungi overgrowth.
• Preserve viral material: Either maintains infectious viability (for culture) or protects nucleic acid (RNA/DNA) (for PCR/NAAT).
• Enable safe transport: Reduces biohazard risk (inactivated VTM).

2. Key Components & Roles

Standard VTM is an isotonic buffered solution with these essential ingredients:

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3. Types of Viral Transport Media

A. Viable (Infectious) VTM

• Purpose: Preserve live virus for virus isolation/culture.
• Features: No lysis agents; nutrients + stabilizers; must stay 2–8°C (refrigerated).
• Use: Research, surveillance, antiviral susceptibility testing.

B. Inactivated (Nucleic Acid) VTM

• Purpose: Lyse virus instantly (kills infectivity) but stabilizes viral RNA/DNA.
• Features: Contains guanidine HCl/guanidine thiocyanate.
• Advantage: Safe handling; stable at room temperature; ideal for PCR/NAAT.
• Use: Clinical diagnostics (COVID-19, influenza, RSV).

C. Universal Transport Medium (UTM)

• All-in-one: Works for viruses, chlamydia, mycoplasma, ureaplasma.
• Commonly used in clinics for broad respiratory/STI testing.

4. Common Clinical Applications

VTM is used for swabs/specimens from:

• Respiratory: Nasopharyngeal (NP), nasal, throat swabs (COVID-19, flu, RSV, adenovirus)
• Ocular: Conjunctival swabs (HSV, adenovirus)
• Genital: Urethral, cervical swabs (HSV, HPV, chlamydia)
• Cutaneous: Vesicle/lesion swabs (VZV, HSV)
• Stool: Enteric viruses (rotavirus, norovirus)
• Blood/CSF: For viremia/neurotropic viruses

5. Storage & Transport Conditions

• Short-term (0–48h):
  • Viable VTM: 2–8°C (refrigerated) — DO NOT FREEZE
  • Inactivated VTM: Room temp (15–30°C) or 2–8°C
• Long-term:
  • Viable: −70°C to −80°C (freezer)
  • Inactivated: Up to 1 week at 2–8°C; months at −20°C
• Critical: Avoid repeated freeze–thaw cycles.

6. Advantages of Using VTM

• Maintains sample integrity → higher test sensitivity/accuracy.
• Reduces contamination → fewer false results.
• Flexible temp stability → easier logistics.
• Safe: Inactivated forms lower infection risk.
• Compatible: Works with PCR, antigen tests, and culture.

7. How to Use VTM (Standard Protocol)

1. Collect specimen with a flocked swab (Dacron/rayon) (not cotton/wooden).
2. Place swab fully into VTM tube; break/remove stick; cap tightly.
3. Label clearly: patient ID, date, sample type, test requested.
4. Store/transport at correct temp (2–8°C or RT).
5. Deliver to lab within 24–48h for best results.

8. Common Misuses & Pitfalls

• ❌ Using bacterial transport media (e.g., Cary-Blair) for viruses → viral death.
• ❌ Freezing viable VTM → ice crystals destroy virus.
• ❌ Delayed transport >48h → viral degradation.
• ❌ Leaky tubes → contamination + biohazard.
• ❌ Cotton/wood swabs → toxic to some viruses.

9. VTM vs. UTM vs. Normal Saline

• Normal Saline: No buffers/antimicrobials → only immediate testing (≤1h)PMC.
• VTM: Optimized for viruses.
• UTM: Universal for viruses + chlamydia + mycoplasma.

10. Summary

Viral Transport Media is essential for reliable viral diagnostics. Choose inactivated VTM for routine PCR (safe, room-temp stable) and viable VTM only when virus culture is needed. Always follow temperature and timing guidelines to preserve sample quality.

The Viral Transport Medium provides a pH-balanced environment and contains antibiotics to inhibit bacterial or fungal contamination. Microbeads inside the vial ensure more rapid sample dispersion and elution.

Hanks buffer creates a neutral environment, which helps increase the survival time and infection stability of the virus.

Product Description

Features of Flocked Swabs

1. Flocked Swabs-collect and release more secretions and cellular material than traditional swab
2. Sample elutes instantaneously into medium
3. Less QNS rejection with DFA+
4. Ergonomic, anatomic and quantitative
5. Comparable results with nasal washes and aspirates+

Cost-effective and multiple test

1. *Culture-all viruses, chlamydia, mycoplasma and ureaplasma
2. Enzyme Immuno Assays (EIA)
3. PCR
4. Nucleic acid amplification assays including chlamydia trachoma tis and neisseria gonorrhoeae (Ct/Ng)

NOTE:

It allows specimens to be stored at room temperature for 30 days without any change.

Regular & mini tube available in 3ml medium fill volumes

We offer both inactivated and non-inactivated virus sampling tubes for collecting samples of influenza, COVID-19, hand, foot, and mouth disease, and other viruses. We provide nasal swabs, throat swabs, nasopharyngeal swabs, and oropharyngeal swabs. We have 3ml and 10ml virus preservation solutions available. We support various OEM and ODM customizations. Please contact us for inquiries; we are the original manufacturer.

I. Main components

It usually consists of a tube body, a cap, and preservation fluid.

1. Tube body: Generally made of polypropylene and other materials, it has a certain degree of hardness and sealing property to prevent sample leakage.
2. Cap: Closely fits the tube body to ensure that the sampling tube is in a sealed state during transportation and storage.
3. Preservation fluid:
   • The main function is to maintain the activity of the virus and prevent the virus from degrading rapidly after sampling. There are various types of preservation fluids, and common ones are inactivated and non-inactivated types.
   • Inactivated preservation fluid can quickly inactivate the virus, making the virus lose its infectivity. At the same time, it ensures the stability of the viral nucleic acid, which is convenient for subsequent nucleic acid detection.
   • Non-inactivated preservation fluid can maintain the activity of the virus and is suitable for culturing the virus and further research

II. Usage method

When performing virus sampling, a specific sampling swab is used to collect human samples, and then the swab is placed in the virus sampling tube. The swab stick is broken to leave the swab head in the preservation fluid. Finally, the cap is covered to complete the sampling.

III. Application scenarios

It is widely used in medical and health institutions, disease prevention and control centers, inspection and quarantine institutions and other places for the detection and monitoring of various viruses such as the novel coronavirus and influenza virus. It plays an important role in large-scale nucleic acid testing, epidemic prevention and control, and disease diagnosis.

In the field of medical diagnostics, accurate and efficient sample collection is crucial. VTM (Viral Transport Medium) swab kits have become indispensable tools for the collection, transport, and preservation of viral specimens. Our VTM swab kits stand out due to their factory strength, supply capacity, product performance, wide application scope, and global sales reach.

Factory Strength

Our VTM swab kits are manufactured in state-of-the-art facilities that leverage advanced technology and adhere to stringent quality control standards. Our factories are staffed by skilled professionals committed to producing reliable and high-quality products. Each VTM swab kit undergoes rigorous testing to ensure it meets international standards, ensuring that healthcare providers receive kits they can trust for accurate diagnostics.

Supply Capacity

We boast a robust supply capacity capable of meeting the increasing global demand for VTM swab kits. Our efficient production processes and well-organized logistics network enable us to handle orders of any size with prompt delivery. Whether supplying hospitals, clinics, or research laboratories, we ensure timely and reliable fulfillment of all orders, regardless of their volume.

Product Performance

Our VTM swab kits are designed for optimal performance in the collection and preservation of viral samples. Each kit includes high-quality flocked swabs and a VTM solution that stabilizes and preserves viral RNA and DNA during transport. The flocked swabs offer superior sample collection and release capabilities, while the VTM solution ensures the integrity of the specimen is maintained until it reaches the testing laboratory. This combination results in more accurate and reliable diagnostic outcomes.

Application Scope

The versatility of our VTM swab kits makes them suitable for a wide range of applications in the medical field. They are essential tools for the collection of specimens for respiratory virus detection, including COVID-19, influenza, and RSV. These kits are also used for bacterial testing, DNA analysis, and other diagnostic applications. In clinical settings, our VTM swab kits enable healthcare providers to obtain high-quality specimens, facilitating accurate and timely diagnosis and treatment decisions.

Global Sales

Our VTM swab kits have a strong presence in the global market, trusted by healthcare providers and researchers worldwide. Our dedication to quality, reliability, and customer satisfaction has earned us a reputation as a leading supplier of VTM swab kits. We cater to diverse markets across continents, ensuring that our products are accessible to healthcare systems around the world. Our global sales network is supported by comprehensive customer service, ensuring that clients receive the support they need throughout the purchasing process.

In conclusion, our VTM swab kits represent the pinnacle of sample collection and preservation technology, combining innovative design, superior performance, and reliable supply. Whether used in hospitals, clinics, or research laboratories, our kits provide the accuracy and efficiency needed for critical medical diagnostics. Discover the difference our VTM swab kits can make and join our global community of satisfied customers today.