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Red eyes might be a sign that a patient is very sick with coronavirus, according to a nurse who has been on the front lines of the pandemic.

Chelsey Earnest, who works at the embattled Life Care Center in Kirkland, Washington, claims that the eyes are a clear tell that someone is infected, CNN reported.

“It’s something that I witnessed in all of them,” Earnest said. “They have, like … allergy eyes.”

Earnest said she and her colleagues, along with admitting doctors at a nearby hospital, all noticed the strange symptom.

“The white part of the eye is not red. It’s more like they have red eye shadow on the outside of their eyes,” Earnest said.

She continued: “We’ve had patients that just had the red eyes as the only symptom that we saw and go to the hospital and pass away.”

“I’ve even had the disaster medical control physician say, ‘Do they have the red eyes?’ And I will say yes. And he’ll say, ‘I’ll find you a bed.’ It’s just something about this, the way that it affects these patients.”

At least 37 deaths have been linked to the COVID-19 outbreak at the Life Care Center.

The Centers for Disease Control and Prevention warns of symptoms such as high fever, dry cough and shortness of breath — but makes no mention of eye issues in the agency’s guidance on the virus.

Meanwhile, the American Academy of Ophthalmology alerted members that there are reports coronavirus is associated with conjunctivitis, which can cause eye reddening, according to CNN.

Doctors are working to understand more about the dangerous bug as it spreads to more than 46,000 people across the country.

Researchers recently made the surprising discovery that loss of taste and smell could be crucial warning signs for carriers of the virus.