Nevada health officials say they are conducting an investigation after two people staying at a five-star Las Vegas hotel and casino contracted Legionnaires’ disease . The guests of the Wynn Las Vegas resort stayed there separately last September and February of this year and were exposed to Legionella bacteria, which causes the severe form of pneumonia . “Both individuals have since recovered,” the Southern Nevada Health District said in a statement this week. Environmental testing conducted by the district showed multiple samples from the facility tested positive for the bacteria. Since then, the resort’s efforts to sanitize its water system have proved effective and the most recent tests show no detectable levels of the bacteria in the affected areas, the district said. The Wynn hotel is seen in Las Vegas, Nevada, in August 2020. Two guests contracted Legionnaires’ disease there since last September.…