A monthslong investigation into a rural California warehouse uncovered an illegal laboratory filled with infectious agents, medical waste and hundreds of mice bioengineered "to catch and carry the COVID-19 virus," according to Fresno County authorities. Health and licensing said Monday that Prestige Biotech, a Chinese medical company registered in Nevada, was operating the unlicensed facility in Reedley, California, a small city about 24 miles southeast of Fresno. The company, according to Reedley City Manager Nicole Zieba, had a goal of being a diagnostics lab.

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