USDA Develops Candidate African Swine Fever Vaccine

Jun 10, 2021

By Greg Cima

A federal research team reported progress toward creating a commercial vaccine against the devastating African swine fever virus.

An article published in May in the Journal of Virology indicates Department of Agriculture scientists at the Plum Island Animal Disease Center in New York created an attenuated vaccine candidate that can reproduce in a continuous cell line, overcoming a limitation that previous vaccine candidates required fresh macrophages from live swine. USDA Agricultural Research Service scientists had developed a previous vaccine candidate that offered effective protection, but the macrophage requirements prevented large-scale production.

Two of the article authors—USDA ARS research microbiologists Manuel Borca, PhD, and Douglas Gladue, PhD—said in a joint message that the ASF virus requires primary swine macrophages to replicate, and those macrophages do not divide. The researchers adapted an ASF virus to reproduce in a cell line that was developed at the ARS from primary porcine epithelial cells, and the attenuated vaccine candidate they produced with that modified virus protected swine as well as their previous vaccine candidate.

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Video: Cleaning Sheep Barns & Setting Up Chutes

Indoor sheep farming in winter at pre-lambing time requires that, at Ewetopia Farms, we need to clean out the barns and manure in order to keep the sheep pens clean, dry and fresh for the pregnant ewes to stay healthy while indoors in confinement. In today’s vlog, we put fresh bedding into all of the barns and we remove manure from the first groups of ewes due to lamb so that they are all ready for lambs being born in the next few days. Also, in preparation for lambing, we moved one of the sorting chutes to the Coveralls with the replacement ewe lambs. This allows us to do sorting and vaccines more easily with them while the barnyard is snow covered and hard to move sheep safely around in. Additionally, it frees up space for the second groups of pregnant ewes where the chute was initially.