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Blastocystis hominis Brumpt


Product category
Product type
Parasitic protozoan
KINGDOM: Chromista
Strain designation
Type strain
Isolation source
Enteric disease research
Infectious disease research
Product format
Mission Collection Item
This is a Mission Collection Item


Biosafety Icon Biosafety Level 2

ATCC determines the biosafety level of a material based on our risk assessment as guided by the current edition of Biosafety in Microbiological and Biomedical Laboratories (BMBL), U.S. Department of Health and Human Services. It is your responsibility to understand the hazards associated with the material per your organization’s policies and procedures as well as any other applicable regulations as enforced by your local or national agencies.

ATCC highly recommends that appropriate personal protective equipment is always used when handling vials. For cultures that require storage in liquid nitrogen, it is important to note that some vials may leak when submersed in liquid nitrogen and will slowly fill with liquid nitrogen. Upon thawing, the conversion of the liquid nitrogen back to its gas phase may result in the vial exploding or blowing off its cap with dangerous force creating flying debris. Unless necessary, ATCC recommends that these cultures be stored in the vapor phase of liquid nitrogen rather than submersed in liquid nitrogen.

Detailed product information


Specific applications
Enteric Research
Food and waterborne pathogen research


Mixed genotype based on SSU rDNA sequence analysis

Handling information

Instruction for complete medium
ATCC Medium 1671
Culture system
Culture maintenance
1.   When the culture has reached or is near peak density remove the growing culture, without agitation from the anaerobic jar and immediately screw the caps down tightly.

2. The strain grows at the bottom of the liquid overlay as a dense mass of cells.  Carefully introduce a sterile Pasteur pipette aseptically through the liquid overlay-air interface (avoid expulsion of air bubbles) and move the tip of the pipette to the cell mass, aspirate approximately one third of the mass into the pipette.  Tighten the cap immediately unless placing the tube directly into an anaerobic jar.

3.   Inoculate a fresh tube of reduced ATCC medium 1671.  Place the freshly inoculated tube into the anaerobic jar with the caps loosened one full turn, prepare the GasPak, and quickly seal the jar.  Incubate at 25°C.

4.   Subculture every 2-3 days.

1.   Two to three days in advance, prepare a 14% (v/v) sterile glycerol plus 14% (v/v) sterile DMSO solution in Stone's Modification of Locke's Solution in the following manner:

      a) Combine 0.84 ml of sterile glycerol and 0.84 ml of sterile DMSO in a 16 x 125 mm screw-capped test tube.  Chemical heat will be liberated from this combination so allow the solution to cool to room temperature.

      b) To the glycerol/DMSO solution add 4.32 ml of Stone's Modification of Locke's Solution.  Mix by inverting several times.

      c) Loosen the cap one full turn and place in an anaerobic jar with an anaerobic GasPak for 2-3 days.

2.   When the test tube cultures are at or near peak density remove the tubes from the anaerobic jar and immediately screw the caps on tightly. One by one gently remove the cells from the bottom of the egg medium slants and pool in a single 16 x 125 mm screw-capped test tube (work quickly to avoid prolonged exposure to air). 

3.   Adjust the concentration to 1.0-2.0 x 107cells/ml using overlay from a reduced tube of medium.  If the concentration of cells is too low centrifuge at 500 X g for 5 minutes.  Adjust the volume of supernatant to yield the desired final cell concentration.

4.   Mix the cell preparation and the cryoprotective agent, prepared in step 1, in equal portions. Thus, the final concentration will equal 7% (v/v) glycerol, 7% (v/v) DMSO and 5.0 x 106 - 1.0 x 107 cells/ml. The time from the mixing of the cell preparation and DMSO stock solution before the freezing process is begun should be no less than 15 min and no longer than 30 min.

5.  Dispense in 0.5 ml aliquots into 1.0 - 2.0 ml sterile plastic screw-capped cryules (special plastic vials for cryopreservation).

6.   Place the vials in a controlled rate freezing unit.  From room temperature cool at -1°C/min to -40°C.  If the freezing unit can compensate for the heat of fusion, maintain rate at        -1°C/min through the heat of fusion.  At -40°C plunge into liquid nitrogen. Alternatively, place the vials in a Nalgene 1°C freezing apparatus.  Place the apparatus at -80°C for 1.5 to 2 hours and then plunge ampules into liquid nitrogen.  (The cooling rate in this apparatus is approximately


7.  The frozen preparations should be stored in either the vapor or liquid phase of a nitrogen refrigerator. Frozen preparations stored below -130°C are stabile indefinitely. Those stored at temperatures above -130°C are progressively less stabile as the storage temperature is elevated.

8.   Before thawing an ampule do the following.  Loosen caps one full turn and place tubes containing ATCC medium 1671 and 25% HIHS in an anaerobic jar.  Add a BBL GasPak (one anaerobic system GasPak per BBL GasPak 100 anaerobic culture jar).  Close the vessel securely and incubate at 35°C for at least 48 hours.  The palladium catalyst in the GasPak jar should be replaced biweekly with fresh catalyst.

9.   Thaw the frozen ampule in a 35°C water bath without agitation until all of the contents are liquid (about 2-3 minutes).

10.          Aseptically and gently, lower a sterile Pasteur pipette from which the air has been expelled to the bottom of the liquid in the ampule and slowly aspirate the entire contents into the pipette.  Be careful to minimize agitation of the fluid and so not introduce air bubbles from the tip of the pipette.

11.          With the cap of the test tube loosened one full turn place it in an anaerobic jar containing a BBL GasPak and incubate at 25°C for at least 48 hours.

12.          Subculture every 2-3 days.


Deposited as
Blastocystis hominis Brumpt
CH Zierdt
Type of isolate
Year of origin
Special collection
NCRR Contract

Legal disclaimers

Intended use
This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use.

The product is provided 'AS IS' and the viability of ATCC® products is warranted for 30 days from the date of shipment, provided that the customer has stored and handled the product according to the information included on the product information sheet, website, and Certificate of Analysis. For living cultures, ATCC lists the media formulation and reagents that have been found to be effective for the product. While other unspecified media and reagents may also produce satisfactory results, a change in the ATCC and/or depositor-recommended protocols may affect the recovery, growth, and/or function of the product. If an alternative medium formulation or reagent is used, the ATCC warranty for viability is no longer valid.  Except as expressly set forth herein, no other warranties of any kind are provided, express or implied, including, but not limited to, any implied warranties of merchantability, fitness for a particular purpose, manufacture according to cGMP standards, typicality, safety, accuracy, and/or noninfringement.


This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use. Any proposed commercial use is prohibited without a license from ATCC.

While ATCC uses reasonable efforts to include accurate and up-to-date information on this product sheet, ATCC makes no warranties or representations as to its accuracy. Citations from scientific literature and patents are provided for informational purposes only. ATCC does not warrant that such information has been confirmed to be accurate or complete and the customer bears the sole responsibility of confirming the accuracy and completeness of any such information.

This product is sent on the condition that the customer is responsible for and assumes all risk and responsibility in connection with the receipt, handling, storage, disposal, and use of the ATCC product including without limitation taking all appropriate safety and handling precautions to minimize health or environmental risk. As a condition of receiving the material, the customer agrees that any activity undertaken with the ATCC product and any progeny or modifications will be conducted in compliance with all applicable laws, regulations, and guidelines. This product is provided 'AS IS' with no representations or warranties whatsoever except as expressly set forth herein and in no event shall ATCC, its parents, subsidiaries, directors, officers, agents, employees, assigns, successors, and affiliates be liable for indirect, special, incidental, or consequential damages of any kind in connection with or arising out of the customer's use of the product. While reasonable effort is made to ensure authenticity and reliability of materials on deposit, ATCC is not liable for damages arising from the misidentification or misrepresentation of such materials.

Please see the material transfer agreement (MTA) for further details regarding the use of this product. The MTA is available at

Permits & Restrictions

Import Permit for the State of Hawaii

If shipping to the U.S. state of Hawaii, you must provide either an import permit or documentation stating that an import permit is not required. We cannot ship this item until we receive this documentation. Contact the Hawaii Department of Agriculture (HDOA), Plant Industry Division, Plant Quarantine Branch to determine if an import permit is required.



Curated Citations

Jones MS, et al. Detection of Blastocystis from stool samples using real-time PCR. Parasitol. Res. 103:551-557, 2008. PubMed: 18488250

Frequently Asked Questions

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