By Svea Herbst-Bayliss NEW YORK (Reuters) -Altai Capital Management is preparing to launch a board fight at OraSure Technologies after the hedge fund, already one of the biggest owners of the medical device maker, increased its holdings, two people familiar with the matter told Reuters. The hedge fund built up its stake from 3% at the end of June to 5% in recent weeks in OraSure, known for its COVID-19 rapid antigen tests, said the people who are not authorized to discuss the matter publicly. The larger ...