How Horses Helped With the Creation Of A COVID-19 Vaccine

People across the United States and Canada began receiving the COVID-19 vaccine this week, less than a year after the novel coronavirus that lead to a worldwide pandemic was first identified. The equine industry played a small but relevant role in this amazing scientific feat.

West Nile Virus first emerged in the United States 1999; in 2005, Fort Dodge Animal Health created a vaccine to protect horses from the mosquito-borne disease. This vaccine was the world's first DNA vaccine approved for human or animal use—and the technology used to make it became key to creating the COVID-19 vaccine.

Conventional vaccines used a killed or inactive form of a virus that teaches the body how to mount an immune response to it. DNA vaccines use small pieces of genetic material from a virus; the material itself is injected into the recipient and their cells transcribe the DNA into messenger RNA, which creates distinct proteins to jumpstart the body's immune response. This immune response will defend against the entire virus. Gene-based vaccines are faster to develop and manufacture than traditional vaccines.

Manufactured by Pfizer, the new COVID-19 vaccine is the next generation of genetic vaccines; it's a novel mRNA vaccine that directly translates into proteins once the cell incorporates it. The equine West Nile DNA vaccine was a beginning step for the creation of this vaccine, proving that nucleic acid-based vaccines were safe and effective.

Read more at EQUUS magazine.

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Foal Cloned From 40-Year-Old Genetic Material Offers Hope For Endangered Species

On Aug. 6, the world's first cloned Przewalski horse was born, giving hope to conservationists of the endangered breed. To create the colt, scientists used genetic material that had been cryopreserved 40 years ago at the San Diego Zoo Global (SDZG) Frozen Zoo.

“Kurt” was born to a domestic surrogate mother. His birth revives genetic diversity that was believed to have been lost decades ago. Dr. Bob Wiese, chief life sciences officer at San Diego Zoo Global, is hopeful that the colt will bring back genetic variation imperative for the future survival of the Przewalski breed.

The Przewalski horse is a wild horse breed from the steppes of central Asia; native populations declined dramatically after World War II because of hunting, severe winters and competition with livestock. The last sighting of a wild Przewalski horse was in 1969.

A captive breeding program was begun in 1899 and included 12 horses; these 12 animals were the foundation for the nearly 2,000 Przewalski horses alive today. However, with such low genetic diversity, these 2,000 individuals are less able to adapt to environmental changes or stressors, and are at risk of inbreeding, which can result in a plethora of unwanted traits.

“Kuporovic” was a captive bred Przewalski horse with a genome that had ancestry to two wild horse founders. Because he had so much genetic variation, scientists preserved his genome in the San Diego Zoo's Frozen Zoo in 1980.

The Zoo partnered with wildlife conservation group Revive & Restore and pet cloning company ViaGen Equine to produce Kurt, who is Kuporovic's exact genetic replica. The tiny foal represents long-term viability of preserved genetic material, offering hope for the survival of all endangered species.

Read more at Science Alert.

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