Warning bells are being sounded about Amazon's (AMZN  ) safety practices during the coronavirus, or COVID-19, pandemic after confirmed cases have been reported at 10 of the online retail giant's distribution centers.

Confirmed cases of the coronavirus have been reported at ten different Amazon distribution centers; on Tuesday, employees at Amazon's Moreno Valley, California facility were only informed once they had arrived at work that co-workers had tested positive for the coronavirus. According to two employees speaking to NBC on the condition of anonymity, there are no plans to close the distribution center.

On Wednesday, Amazon had similarly announced that an employee at its Staten Island, New York distribution center had tested positive, and confirmed that they had entered quarantine. On Monday, Amazon had confirmed that three workers at its distribution center in Shepherdsville, Kentucky, had tested positive as well. While Amazon has temporarily closed its Shepherdsville and Queens facilities, it has stated an intention to avoid mass closures.

"Much of the essential work we do cannot be done from home," said CEO Jeff Bezos, "We've implemented a series of preventative health measures for employees and contractors at our sites around the world - everything from increasing the frequency and intensity of cleaning to adjusting our practices in fulfillment centers to ensure the recommended social distancing guidelines."

Workers have voiced concerns regarding Amazon's refusal to close warehouses and what they see as the company not taking the pandemic seriously and ignoring the welfare of its employees. Two workers who spoke to NBC mentioned that there was no paid time off being offered for employees afraid to come into work and that while they would not lose their jobs by staying home, they did so at their own cost. Concern had been raised about the lack of information available at the Moreno Valley facility, with some workers not learning about the infections until after their shifts had ended.

Internal support for warehouse workers, as well as those in Amazon's data centers and employees at Whole Foods branches, can be found among the company's tech workers who have had the luxury of working at home. Tech workers circulated a letter voicing their support for their co-workers and decrying what they saw as an apathetic attitude by Amazon towards its workers. "Even as office workers are asked to work from home, Amazon's measures to protect FC (fulfillment center) and DC (data center) workers, as well as shop floor workers at Whole Foods, have ranged from inadequate to openly negligent," says the letter.

An additional concern has circulated on social media, where consumers have voiced their worries about packages received from Amazon, which they fear might carry the coronavirus.