They should then receive a high titer low passage booster every 3 - 4 weeks until they are approximately 16 weeks old. (polosprings.com)
VANGUARD Plus CPV is a high - titer, modified - live canine parvovirus (CPV) strain attenuated by low passage on an established canine cell line. (zoetisus.com)
These are low passage wild type parental clones suitable for a single electroporation and germline transmission. (mmrrc.org)