− | Ideally, this should take place once antigen-negative status has been determined by laboratory testing. ''Leukogen'' is a subunit vaccine (using envelope protein gp70) produced in ''E. coli'' mixed with Quill-A and alhydrogel. Others include inactivated virus and canarypox recombinants, but all MUST include FeLV-A. | + | Ideally, this should take place once antigen-negative status has been determined by laboratory testing. 'Leukogen' is a subunit vaccine (using envelope protein gp70) produced in ''E. coli'' mixed with Quill-A and alhydrogel. Others include inactivated virus and canarypox recombinants, but all MUST include FeLV-A. |