By Svea Herbst-Bayliss

NEW YORK (Reuters) -Prominent healthcare entrepreneur Ron Zwanziger warned on Monday he may pursue a more “adversarial path” if the OraSure Technologies board continues to resist his offer to buy the medical devices company, according to a letter seen by Reuters.

OraSure’s stock price has fallen further in the weeks after Zwanziger’s unsolicited all-cash offer, made earlier in the summer, was rebuffed. Other investors have grown concerned and reached out to Zwanziger, he wrote, and Monday’s letter dialed up the pressure for a deal.

“If the Board is not willing to entertain a collaborative discourse, we will be left with no choice but to consider all alternatives available,” the letter said. “We would prefer to work together with you in a collaborative fashion to r

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