Abstract
Methods are presented for the cryopreservation of a sheathed microfilaria, Brugia malayi, and an unsheathed species, Dirofilaria corynodes. The former survived best when frozen at the rate of -0.8 degree or -0.5 degree C per minute using 9% dimethyl sulfoxide (DMSO) as the cryopreservative. Approximately 52-79% of the thawed microfilariae developed to the third stage in Aedes aegypti mosquitoes versus 79% of the unfrozen specimens. For D. corynodes the optimum freezing rate was -2 degrees or -5 degrees C per minute, and 6% DMSO combined with 0.004 M polyvinylpyrrolidone (PVP) afforded the best cryoprotective effect. The development of thawed microfilariae in mosquitoes ranged from 22-32% versus 29% for unfrozen specimens. In general, the viability of both species of microfilaria was retained best when stored in liquid nitrogen (-196 degrees C). The entire life cycle of B. malayi was completed in the laboratory using cryopreserved microfilariae as the initial source. The cryopreservation of Wuchereria bancrofti also is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The American journal of tropical medicine and hygiene
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
