SUMMARY
Microfilariae of Mansonella ozzardi, concentrated from human blood, frozen with a cryoprotectant chemical, and stored at liquid or vaporphase liquid nitrogen temperatures were motile when thawed after 2½ years of preservation.
Microfilariae of Mansonella ozzardi, concentrated from human blood, frozen with a cryoprotectant chemical, and stored at liquid or vaporphase liquid nitrogen temperatures were motile when thawed after 2½ years of preservation.