Two Tesla employees, who had been working at home for nearly two weeks, have tested positive for COVID-19, according to an internal email sent Thursday morning by the company’s head of environmental, health, and safety department and viewed by TechCrunch .

The employees were not symptomatic in the office, and both are quarantined at home and recovering well, according to the email from Tesla’s EHS department head Laurie Shelby. Their co-workers, who were already working from home for nearly two weeks as well, were notified so they can quarantine, the email read. The email did not disclose the locations where the employees were working.

“In both cases, interactions with the individuals had a low likelihood of transmission based on the minimal staff onsite and social distancing measures we took earlier this month,” Shelby wrote in the email.

Tesla could not be reached for comment. Business Insider previously reported on the same internal email.

The email has heightened concern among several Tesla employees that TechCrunch has spoken to, as they weigh the risk of coming into work or using paid-time off or unpaid leave to stay at home. Tesla employs more than 48,000 people at its headquarters, factories, sales and service centers and delivery hubs throughout the U.S. While some employees are able to work from home, the company still has workers at its delivery and service centers, as well as an estimated 2,500 people at its Fremont, Calif. factory.

Tesla suspended production at its Fremont factory beginning March 23, days after a shelter-in-place order went into effect in Alameda County due to the COVID-19 pandemic. Some basic operations that support Tesla’s charging infrastructure and what it describes as its “vehicle and energy services operations” have continued at the factory, which under normal circumstances employs more than 10,000 people.

The decision to suspend production at Fremont came after a multi-day public tussle between the automaker and local officials in Alameda County over what was considered an “essential” business.

Tesla has also suspended operations at its factory in Buffalo, N.Y., except for “those parts and supplies necessary for service, infrastructure and critical supply chains,” the company said in a statement. Tesla CEO Elon Musk tweeted Wednesday that he plans to reopen the Buffalo factory to produce ventilators, a critical piece of medical equipment used in severe cases of COVID-19.

The email comes just two days after reports of at least two positive COVID-19 cases at SpaceX, another company headed up Musk. The positive cases at SpaceX sent some employees into quarantine, CNBC reported. The company is making hand sanitizer in house and taking other steps to protect nervous workers, according to CNBC. TechCrunch could not reach SpaceX for comment.

COVID-19, the disease caused by coronavirus, has rippled through corporate and industrial America. Manufacturers have suspended production of vehicles, tech companies have ordered employees to work from home and city, county and state governments have issued a variety of orders to try to slow the spread of COVID-19.

For instance, California Gov. Gavin Newsom issued a stay-at-home directive that ordered all nonessential businesses to close and for residents to only leave their homes for essential needs like groceries or to visit the pharmacy. Other states where Tesla has operations such as New York are also under a stay-at-home order.

Musk’s actions during the pandemic have caused a variety of reactions among employees, critics and his millions of Twitter followers. He has appeared dismissive of COVID-19 in emails to employees and on Twitter, where he has spread misinformation on the disease, including that children are “essentially immune,” a statement that contradicts information provided by the Centers for Disease Control and Prevention. In one internal email sent to SpaceX employees, Musk noted that they were more likely to die in a car crash than from the disease.

Even as Musk seemed to downplay the disease, he has also stepped up to donate medical supplies needed by hospitals and has directed employees to not come to work if they feel ill or are uncomfortable. Tesla employees have received emails from human resources head Valerie Workman that if they could not or were reluctant to come to work they could use PTO or take unpaid time off after they exhaust their PTO. The email told one employee (who spoke to TechCrunch on condition of anonymity) that they would be not be penalized for their decision or face disciplinary action for attendance based on health or impossibility to come to work.

Musk has also donated essential personal protective equipment to hospitals that are facing a shortage of these supplies, and has committed to trying to help ramp up production of ventilators.