I'm sure there are more reasons, but modified herpes and HIV have both been used as experimental cancer treatments.

Edit: It appears they made a variety of in-vitro tests during their peak operating period. For diseases, pregnancy, drugs, etc. So probably more about "criminally sloppy lab" than any terror motive.

An old wayback grab of their product page: https://web.archive.org/web/20190731163304/http://universal-...