OMAHA, Neb. (AP) - More than a year after U.S. health care workers on the front lines against COVID-19 were saluted as heroes with nightly clapping from windows and balconies, some are being issued panic buttons in case of assault and ditching their scrubs before going out in public for fear of harassment.Across the country, doctors and nurses are dealing with hostility, threats and violence from patients angry over safety rules designed to keep the scourge from spreading.RELATED: ‘Please do the right thing’: Biden receives COVID-19 booster shot on camera Monday"A year ago, we’re health care heroes and everybody’s clapping for us," said Dr.