New York (CNN Business)As millions of Americans shelter inside their homes, trying to avoid exposure to the Covid-19 pandemic, many workers continue to risk exposure to the virus on the front lines. They’ve been deemed critical by the federal government, because they’re delivering food and packages, stocking grocery store shelves and operating public transit — often around the clock. “It’s scary,” said Tony Mazzella, a UPS driver. “I’m a new Yorker. I typically don’t get scared of anything, but you know what? It’s essential that I’m here because people rely on their deliveries,” he said.Tony Mazzella is one of nearly half a million UPS (UPS) workers around the world still on the job. UPS and other shipping companies, including FedEx (FDX), DHL and the United States Postal Service are considered “critical infrastructure” by the federal government and therefore do not have to shut down.UPS confirmed some of its employees have tested positive for COVID-19. The company says it follows recommended cleaning and sanitation guidelines before allowing employees to return to work, and it provides “income and health care security provisions for employees who test positive, or for employees who are required by a physician to quarantine, or for employees who

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