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Are these genetically engineered cows the future of medicine?

They look like normal black-and-white Holstein cows, a common sight in Western Iowa. But these cows are special: used not for their milk or meat, but for their blood. They’re plasma donors, and one day, the life they save may be your own. The cows were genetically engineered by biotech company SAB Biotherapeutics to produce human antibodies, proteins that fight pathogens. These antibodies could one day treat infectious diseases like Ebola, influenza, and Zika — and their potential to address global outbreaks was recognized this summer by the World Health Organization. SAB’s cattle are just the latest example of lab-made animals engineered to be drug factories. Last year, the US Food and Drug Administration approved a genetically modified chicken that makes a drug in its eggs to treat "lysosomal acid lipase deficiency" — a rare genetic condition that prevents the body from breaking down fatty molecules inside cells. In 2014, the FDA approved a drug collected from the milk of lab-made rabbits to treat hereditary angioedema, a genetic disease that causes body swelling and can be fatal. And in 2009, the FDA approved a genetically altered goat that can make a drug in its milk that prevents fatal blood clots.

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The Verge
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