The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Apr. 05, 1985
Gerben F De Boer, Lelystad, NL;
Abstract
The invention relates to a highly immunogenic virus preparation derived by attenuation employing serial passages in avian cell cultures and six plaque purification steps from a Marek's disease virus strain, belonging to Avian Herpesvirus serotype-1. The original virus strain MDV CVI-988 was recovered from a healthy chicken (Avian Diseases 16: 108-125, 1972). The live purified Marek's disease vaccine so obtained is innocuous for specific pathogen free Rhode Island Red chickens which are highly susceptible for development of Marek's disease tumors. The monovalent virus preparation, according to the invention, demonstrated in comparison with Marek's disease vaccines based on the same strain, currently in use at a lower cell passage level, an improved protective efficacy against challenge infection by two representatives of virulent Marek's disease virus. The monovalent virus preparation, according to the invention, provided significantly better protection than current MDV CVI-988 vaccine to challenge infection with a representative of the group of newly emerging very virulent strains of Marek's disease virus, MDV RB/1B. The monovalent virus preparation, according to the invention, provided significantly better protection than is HVT FC126 vaccine to challenge infection with another representative of the group of very virulent MD viruses, MDV Tun.