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1. To achieve the best results, set up cultures with several different inocula (e.g. 0.25 mL, 0.5 mL, 1.0 mL).  Harvest cultures and pool when the culture that received the lowest inoculum is at or near peak density.
2. If the cell concentration exceeds the required level, do not centrifuge, but adjust the concentration to between 2 x 10⁶ and 2 x 10⁷cells/mL with fresh medium.  If the concentration is too low, centrifuge at 600 x g for 5 min and resuspend the pellet in the volume of fresh medium required to yield the desired concentration.
3. While cells are centrifuging, prepare a 15% (v/v) solution of sterile DMSO as follows:  Add the required volume of DMSO to a glass screw-capped test tube and place it in an ice bath.  Allow the DMSO to solidify.  Add the required volume of refrigerated medium.  Dissolve the DMSO by inverting the tube several times. 
   *NOTE: If the DMSO solution is not prepared on ice, an exothermic reaction will occur that may precipitate certain components of the medium.
4. 4.  Mix the cell preparation and the DMSO in equal portions. Thus, the final concentration will be between 10⁶ and 10⁷ cells/mL and 7.5% (v/v) DMSO. 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 cryovials.
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 -1°C/min.)  
7. The frozen preparations are stored in either the vapor or liquid phase of a nitrogen freezer.
8. To establish a culture from the frozen state, place an ampule in a water bath set at 35°C (2-3 min). Immerse the vial just sufficiently to cover the frozen material. Do not agitate the vial.
9. Immediately after thawing, aseptically remove the contents of the ampule and inoculate into 5 mL of fresh ATCC medium 712 supplemented with 10% HIFBS in a T-25 tissue culture flask.  Incubate at 35°C. 

Qvarnstrom Y, et al. Characterization of a new pathogenic Acanthamoeba Species, A. byersi n. sp., isolated from a human with fatal amoebic encephalitis. J Eukaryot Microbiol 60(6): 626-633, 2013. PubMed: 23879685

Nucleotide (GenBank) : KC822461 Acanthamoeba sp. CDC:V621 clone 1 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822462 Acanthamoeba sp. CDC:V621 clone 2 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822463 Acanthamoeba sp. CDC:V621 clone 3 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822464 Acanthamoeba sp. CDC:V621 clone 4 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822465 Acanthamoeba sp. CDC:V621 clone 5 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822466 Acanthamoeba sp. CDC:V621 clone 6 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822467 Acanthamoeba sp. CDC:V621 clone 7 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822468 Acanthamoeba sp. CDC:V621 clone 8 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822469 Acanthamoeba sp. CDC:V621 clone 9 18S ribosomal RNA gene, partial sequence

Nucleotide (GenBank) : KC822470 Acanthamoeba sp. CDC:V621 clone 10 18S ribosomal RNA gene, partial sequence