Abstract：
:Despite the worldwide application of embryo-freezing technology as the means of preserving germplasm of mammalian species, there is no information available on the possible transmission of infectious agents to cryopreserved embryos via contaminated liquid nitrogen (LN). Recently, it has been reported that new methods of cryopreservation which employ ultrarapid freezing or vitrification require direct contact between the freezing medium containing oocytes or embryos and liquid phase nitrogen (LPN). As models for human and animal viral pathogens three bovine viruses, bovine viral diarrhea virus (BVDV), bovine herpesvirus-1 (BHV), and bovine immunodeficiency virus (BIV), were employed to study the potential for their transmission by experimentally contaminated LN to embryos frozen and stored in open freezing containers. Bovine embryos in a mixture of 20% ethylene glycol, 20% ME(2)SO, and 0.6% sucrose were vitrified in either unsealed standard 0.25 ml or modified open pulled straws or in plastic cryovials and then plunged into contaminated LPN. After 3-5 weeks of storage in LN, embryos were thawed and sequentially washed and only those with intact ZP were pooled together and tested in batches of three for viral contamination. From this pool of 83 batches, 13 of 61 (21.3%) batches exposed to BVDV and BHV-1 tested positive for viral association while all 22 batches exposed to BIV in unsealed containers tested negative. All control embryos vitrified in sealed cryovials and straws were free from viral contamination.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
Bielanski A,Nadin-Davis S,Sapp T,Lutze-Wallace Cdoi
10.1006/cryo.1999.2227subject
Has Abstractpub_date
2000-03-01 00:00:00pages
110-6issue
2eissn
0011-2240issn
1090-2392pii
S0011-2240(99)92227-7journal_volume
40pub_type
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