{"id":125598,"date":"2026-03-04T02:19:27","date_gmt":"2026-03-04T09:19:27","guid":{"rendered":"https:\/\/purmabiologics.com\/blog\/?post_type=research_article&p=125598"},"modified":"2026-08-27T14:58:35","modified_gmt":"2026-08-27T20:58:35","slug":"how-to-eradicate-mycoplasma-in-your-lab","status":"publish","type":"research_article","link":"https:\/\/purmabiologics.com\/blog\/research\/how-to-eradicate-mycoplasma-in-your-lab\/","title":{"rendered":"How to Eradicate Mycoplasma in Your Lab: A 5-Step Protocol From 30 Years of Expertise"},"content":{"rendered":"

Why You Need a Systematic Protocol \u2014 Not Just Good Intentions<\/h2>\n

Every cell culture lab has some awareness of mycoplasma contamination. Most researchers have encountered it at some point. Many have lost weeks of work to it. Yet despite this widespread awareness, contamination rates remain stubbornly high \u2014 with published studies consistently reporting that 15\u201335% of continuous cell cultures are contaminated at any given time. In some surveys, the number exceeds 60%.<\/p>\n

The reason for this gap between awareness and action is straightforward: knowing that mycoplasma is a problem is not the same as having a protocol<\/em> to prevent it. Good intentions \u2014 “we should test more often,” “we should be more careful” \u2014 don’t translate into contamination-free labs. What works is a defined, repeatable set of practices that every person in the lab follows, every day, without exception.<\/p>\n

The protocol outlined in this article is built on three decades of hands-on mycoplasma research and product development at PurMa Biologics<\/a>. It addresses the five primary vectors through which mycoplasma enters and spreads in mammalian cell culture<\/strong> laboratories, and for each vector, it provides a specific, actionable countermeasure. The steps are ordered from infrastructure-level prevention (incubator isolation) through to daily personal practices (masking and surface decontamination), creating a layered defense that is far more effective than any single measure alone.<\/p>\n

\"5-Step
The complete 5-step mycoplasma eradication protocol \u2014 each step addresses a specific contamination vector.<\/figcaption><\/figure>\n
1<\/div>

Step 1: Isolate Your CO\u2082 Incubator \u2014 Do Not Share With Another Lab<\/h2><\/div>

This is the most impactful infrastructure decision you can make, and it’s the one most often compromised in shared laboratory facilities. The CO\u2082 incubator is not just a warm box \u2014 it’s an enclosed ecosystem with internal fans, air currents, and humidity that actively circulate particles between every flask, plate, and dish stored inside.<\/p>\n

When you share an incubator with another lab, you are placing the integrity of your entire cell culture program in someone else’s hands. If a researcher from a neighboring lab introduces a contaminated flask \u2014 even unknowingly \u2014 the incubator’s internal air circulation will distribute mycoplasma-containing particles throughout the chamber. Research has demonstrated that airborne particles and aerosols generated during culture manipulations are among the greatest sources of microbial contamination, and incubator fans actively amplify this effect every time the door opens and closes.<\/p>\n

The recommendation is absolute: dedicate one CO\u2082 incubator per laboratory.<\/strong> If complete separation isn’t immediately feasible, at minimum ensure that cultures from different labs are isolated in sealed containers within the incubator \u2014 never open plates or unsealed dishes alongside another lab’s cultures. But understand that sealed containers are a compromise, not a solution. True isolation is the only reliable prevention.<\/p>\n

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\u26a0\ufe0f The Hidden Risk<\/div>\n

Even labs with excellent aseptic technique can be contaminated through a shared incubator. You can control your own practices perfectly and still have mycoplasma introduced by another group that doesn’t test as rigorously. Incubator isolation protects you from risks you cannot control.<\/p>\n<\/div>\n

Additionally, implement a regular incubator cleaning schedule. Remove all vessels, shelves, and trays periodically, and decontaminate internal surfaces with proven disinfectants. PurMa Biologics manufactures a proprietary CO\u2082 incubator treatment<\/strong> specifically designed to maintain pathogen-free conditions inside the chamber \u2014 a critical complement to the physical isolation strategy.<\/p>\n<\/div><\/div>\n

2<\/div>

Step 2: PCR Test Every Incoming Cell Line Before It Enters Your Lab<\/h2><\/div>

The second most common route for mycoplasma to enter your lab isn’t through the air or from your skin \u2014 it’s through the front door, carried in a flask of cells from another laboratory. Published literature consistently identifies previously contaminated cell cultures from other research groups as the single largest external<\/em> source of mycoplasma contamination. A single infected line, once introduced, can compromise every other culture in the facility within weeks.<\/p>\n

Cell lines obtained from reputable repositories \u2014 such as ATCC, DSMZ, or other established biobanks \u2014 undergo rigorous mycoplasma testing before distribution and can generally be trusted. However, the reality of research is that many valuable and irreplaceable cell lines come from collaborator labs, core facilities, or legacy freezer stocks with uncertain provenance. These lines must be treated as potentially contaminated until proven otherwise.<\/p>\n

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\ud83e\uddec<\/div>\n
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PurMa Mycoplasma PCR Detection Kit<\/h4>\n

Cat# P5M011404<\/span><\/p>\n

This kit provides species-level identification of mycoplasma contamination \u2014 not just a positive\/negative result. Knowing whether you’re dealing with M. orale<\/em> (human origin, likely from lab personnel) or M. arginini<\/em> (bovine origin, likely from serum) tells you where the contamination came from and how to prevent recurrence. PCR-based detection delivers results within hours, versus the 4\u20135 weeks required by traditional agar culture methods.<\/p>\n

View Mycoplasma Detection & Elimination Reagents \u2192<\/a><\/div>\n<\/div>\n

The protocol is simple:<\/strong> every cell line from an external source gets quarantined in a separate incubator or sealed container and tested with the PurMa Mycoplasma PCR Detection Kit before it is allowed anywhere near your working cultures. No exceptions. It doesn’t matter how trusted the collaborator is, how reputable the institution is, or how urgently you need the cells. Test first. Introduce second. This single practice has prevented more contamination events than any other measure in cell culture history.<\/p>\n<\/div><\/div>\n

3<\/div>

Step 3: Implement Weekly Routine Screening of All Reagents and Cultures<\/h2><\/div>

Testing incoming cell lines is essential, but it’s not sufficient. Mycoplasma can enter your cultures at any time \u2014 through contaminated reagents, through human transmission during routine handling, through cross-contamination from shared equipment. The only way to catch contamination before it compromises your data is through consistent, scheduled screening.<\/p>\n

The recommended testing schedule is weekly<\/strong>. At an absolute minimum, screen every two weeks. Your testing should cover four critical targets:<\/p>\n

Cell culture media<\/strong> \u2014 Test each batch of cell culture media<\/strong>, whether commercially purchased or prepared in-house using proprietary chemically defined media<\/strong> formulations. Contamination can be introduced during handling, aliquoting, or storage.<\/p>\n

Fetal bovine serum (FBS)<\/strong> \u2014 Premium fetal bovine serum<\/strong> is a known potential vector for bovine-origin mycoplasma species, particularly M. arginini<\/em> and A. laidlawii<\/em>. Even reputable serum suppliers cannot guarantee 100% mycoplasma-free product without independent verification on your end.<\/p>\n

Cell culture water<\/strong> \u2014 Water used in media preparation, washing, and other cell culture applications should be tested regularly. Contaminated water sources can introduce mycoplasma that persists through subsequent media preparation steps.<\/p>\n

Cell supernatants<\/strong> \u2014 This is your most direct indicator. Testing the supernatant of your actively growing cultures tells you whether the cells themselves \u2014 the cultures producing your experimental data \u2014 are currently contaminated.<\/p>\n

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\u2705 Build It Into Your Calendar<\/div>\n

The most effective approach is to designate a specific day each week as “mycoplasma testing day” and make it non-negotiable. Monday mornings work well \u2014 it catches any contamination that may have been introduced during the previous week while giving you time to respond before critical experiments later in the week. Document every test result. A contamination log is both a quality control tool and an early warning system that reveals trends before they become crises.<\/p>\n<\/div>\n<\/div><\/div>\n

4<\/div>

Step 4: Mask Up and Decontaminate Surfaces Before Every Session<\/h2><\/div>

This step addresses the single greatest source of mycoplasma contamination in any lab: you.<\/strong><\/p>\n

The data is unambiguous. Over 80% of laboratory technicians carry mycoplasma in their oral cavity and oropharynx. The most commonly isolated species \u2014 M. orale<\/em>, M. fermentans<\/em>, and M. salivarium<\/em> \u2014 are human commensals that colonize healthy individuals without causing symptoms. You don’t know you’re carrying them. You can’t prevent yourself from carrying them. But you can prevent them from reaching your cultures.<\/p>\n

Wear a mask when checking cells under the microscope.<\/strong> This is the single most exposed moment in cell culture work. You’re leaning directly over your cultures, often for extended periods, breathing directly onto flask surfaces and the surrounding bench area. A mask \u2014 even a standard surgical mask \u2014 creates a physical barrier that dramatically reduces the transfer of oral mycoplasma to your workspace.<\/p>\n

But masking alone isn’t enough. Mycoplasma that has already been deposited on surfaces can remain viable for four to six days, waiting to be transferred to your cultures via gloves, pipettors, or any other point of contact. Surface decontamination before each work session is essential.<\/p>\n

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\ud83e\uddf4<\/div>\n
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PurMa Mycoplasma Removal Spray (Mycospray)<\/h4>\n

Cat# P5M010405<\/span><\/p>\n

Apply to gloves, hood surfaces, microscope stages, pipettors, and all working surfaces at minimum 2 minutes before use<\/strong>. PurMa Mycoplasma Removal Spray is formulated to destroy mycoplasma at the DNA level, achieving 100% elimination of A. laidlawii<\/em>, M. arginini<\/em>, M. bovis<\/em>, M. fermentans<\/em>, M. hominis<\/em>, M. hyorhinis<\/em>, and M. orale<\/em>. Unlike standard 70% ethanol, which has limited and unreliable efficacy against mycoplasma, this formulation specifically targets the organisms you’re most concerned about. It’s safe for skin contact and produces no harmful vapors at room temperature. Use at least three times per week.<\/p>\n

Learn More About Mycoplasma Removal Spray \u2192<\/a><\/div>\n<\/div>\n

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\ud83d\udca1 The 2-Minute Rule<\/div>\n

Apply PurMa Mycoplasma Removal Spray to all surfaces and let it sit for a full 2 minutes before beginning work. Do not wipe it dry \u2014 let the formulation work. This brief waiting period is the difference between surface disinfection and merely wetting the surface. Build it into your routine: spray, set a timer, prepare your materials, and begin work when the timer sounds.<\/p>\n<\/div>\n<\/div><\/div>\n

5<\/div>

Step 5: Apply Broad-Spectrum Lab Surface Sanitization Twice Weekly<\/h2><\/div>

Steps 1 through 4 target mycoplasma specifically. Step 5 broadens the defense to cover all pathogens \u2014 because mycoplasma is not the only contaminant threatening your cultures, and a truly clean lab requires comprehensive surface management.<\/p>\n

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\ud83d\udee1\ufe0f<\/div>\n
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PurMacept\u2122 Lab Surface Sanitizer (10X)<\/h4>\n

Cat# P3R119210<\/span><\/p>\n

This proprietary lab surface sanitizer<\/strong> is designed for twice-weekly application to all lab surfaces \u2014 benchtops, incubator exteriors, equipment surfaces, door handles, refrigerator handles, and any other shared contact points. Unlike the targeted mycoplasma action of PurMa Mycoplasma Removal Spray, PurMacept\u2122 provides broad-spectrum pathogen elimination that prevents any microorganism from establishing on treated surfaces. The two products are complementary: Mycospray for immediate pre-session decontamination, PurMacept\u2122 for ongoing environmental control.<\/p>\n

Learn More About Lab Surface Sanitizer \u2192<\/a><\/div>\n<\/div>\n

The logic behind twice-weekly application is straightforward. Mycoplasma can survive on surfaces for up to six days. By sanitizing every three to four days, you ensure that no surface in your lab remains untreated long enough for deposited organisms to accumulate and pose a contamination risk. This creates an environment where even if mycoplasma is introduced \u2014 through a visitor, a new technician, or a momentary lapse in masking protocol \u2014 it cannot persist long enough to reach your cultures.<\/p>\n

Think of it this way: Steps 1\u20133 prevent mycoplasma from entering and detect it early. Step 4 blocks the primary transmission pathway. Step 5 ensures that whatever gets through the first four layers doesn’t survive to cause contamination. It’s defense in depth \u2014 and it works.<\/p>\n<\/div><\/div>\n

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From PurMa Biologics<\/p>\n

The full mycoplasma toolkit<\/p>\n

Detection, treatment and decontamination are three separate jobs. PurMa makes products for all three: a PCR detection kit, a three reagent treatment kit, growth media for culture based confirmation, and a removal spray for incubators and hoods.<\/p>\n

Mycoplasma detection and elimination<\/a>Mycoplasma PCR Detection Kit<\/a><\/p>\n

Made in the USA and manufactured in house. Certificate of Analysis with every lot.<\/strong> Bulk pricing, purchase orders and custom formulations welcome.<\/p>\n<\/div>\n

When Contamination Is Found: Triage and Treatment<\/h2>\n

Even with the best prevention protocol, contamination can occasionally occur. The critical factor isn’t whether it ever happens \u2014 it’s how quickly you detect it and how decisively you respond.<\/p>\n

First Response: Quarantine Immediately<\/h3>\n

The moment a culture tests positive for mycoplasma, remove it from the shared incubator and isolate it completely. Do not wait for a confirmatory test. Do not continue working with it “just for this one experiment.” Mycoplasma spreads through aerosols, surface contact, and shared equipment \u2014 every hour a contaminated culture remains in your workspace increases the risk of cross-contamination to everything around it.<\/p>\n

Decision Point: Discard or Treat?<\/h3>\n

For most contaminated cultures, the safest and most efficient response is to discard the affected cells and restart from clean frozen stocks. If you’ve followed good cell banking practices \u2014 maintaining seed stocks from verified clean sources \u2014 this allows rapid recovery with minimal disruption.<\/p>\n

However, there are situations where disposal isn’t an option: stable transfectants developed over months, irreplaceable hybridomas, monoclonal antibody-producing lines, or primary cultures that cannot be re-derived. For these high-value lines, specialized treatment is justified.<\/p>\n

The PurMa Mycoplasma Treatment Kit (MTK, 100X) provides a sequential three-phase treatment protocol \u2014 MTR-I, followed by MTR-II, then MTR-III \u2014 designed to eliminate mycoplasma from live cells without destroying the host culture. The treatment is effective across multiple mycoplasma species, but it requires careful adherence to the protocol and post-treatment retesting to confirm successful eradication. As PurMa Biologics emphasizes from three decades of working with this pathogen: treatment is possible, but prevention is always preferable.<\/p>\n

\u26a0\ufe0f After Any Contamination Event<\/div>

Don’t just treat the affected culture \u2014 treat the environment. Perform a thorough decontamination of the incubator, hood, and all shared equipment using PurMa Mycoplasma Removal Spray. Apply PurMacept\u2122 Lab Surface Sanitizer to all lab surfaces. Then test your remaining cultures to assess whether the contamination has spread. A contamination event is both a problem to solve and an opportunity to reinforce your prevention protocol.<\/p>\n<\/div>\n

Because serum is one of the routes mycoplasma enters a laboratory, where you buy it is part of the control strategy. PurMa’s fetal bovine serum<\/a> is gamma irradiated and heat inactivated, and every lot is tested for sterility, endotoxin and a full virus panel before it ships.<\/p>\n

The Complete Ecosystem: Why Reagent Quality Matters<\/h2>\n

Mycoplasma prevention doesn’t exist in isolation from the rest of your cell culture practice. The quality and integrity of every reagent you use \u2014 from cell culture media<\/strong> and premium fetal bovine serum<\/strong> to cell culture suited buffers<\/strong>, cell culture suited PBS<\/strong>, and cell culture suited antibiotics<\/strong> \u2014 contributes to the overall resilience of your cultures against contamination.<\/p>\n

Poorly manufactured reagents can introduce contaminants directly. Inconsistent reagent quality can stress cells, making them more susceptible to mycoplasma-induced damage. And reagents prepared without adequate quality control may contain trace endotoxins, heavy metals, or other impurities that compromise cell health in ways that mimic \u2014 or compound \u2014 the effects of mycoplasma contamination.<\/p>\n

This is why PurMa Biologics approaches cell culture as a complete ecosystem rather than a collection of individual products. From proprietary chemically defined media<\/strong> manufactured under stringent quality control, to water and buffers tested for endotoxin and mycoplasma contamination, to the proprietary CO\u2082 incubator treatment<\/strong> that keeps your incubator environment pathogen-free \u2014 every element is designed to work together to maintain the conditions under which healthy, uncontaminated cells produce reliable, reproducible data.<\/p>\n

“The fight against mycoplasma isn’t won by a single product or a single practice. It’s won by a system \u2014 a layered, comprehensive approach where every element of your cell culture workflow contributes to contamination prevention. That’s what three decades of working with this pathogen has taught us.”<\/p><\/blockquote>\n

When your mammalian cell culture reagents<\/strong> are manufactured to the highest standards, your detection protocols are rigorous, your surfaces are decontaminated, and your personal practices are disciplined, mycoplasma contamination becomes manageable \u2014 not inevitable. That shift in mindset, from reactive to preventive, is ultimately what separates labs that struggle with contamination from labs that don’t.<\/p>\n

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Related guides<\/p>\n