Because so many people close to President Trump have tested positive for COVID-19 in the past week, Pence’s exposure is certainly not in question. As of Friday, Pence had reportedly tested negative for the virus.

However, false-negative results are common in the early days of infection. According to Johns Hopkins University research, if testing occurs on day eight of an infection—usually three days after symptom onset—results are more accurate. Now, people are wondering if conjunctivitis, commonly known as pink eye, is an early COVID-19 symptom for Pence.

“Ultimately, we don’t fully know the incidence and prevalence of conjunctivitis in people diagnosed with COVID-19,” says Johnstone M. Kim, MD, a board-certified ophthalmologist and Verywell Health Medical Expert Board member. “What we do know is that conjunctivitis can be a sign of the disease, but it is very nonspecific without other associated symptoms. Occasionally, it can be the only symptom in some people.”

Two studies published this summer in JAMA Ophthalmology suggest conjunctivitis can be a COVID-19 symptom, though one of them focuses exclusively on children.

A quarter of 216 hospitalized pediatric COVID-19 patients in Wuhan, China, experienced conjunctival discharge, eye rubbing, and conjunctival congestion between January 26 to March 18.

Researchers reported that children experiencing coughing and more systemic symptoms of COVID-19 were most likely to experience conjunctivitis.

A separate study looked at two adults with COVID-19 and conjunctivitis.

The first, a 29-year-old male, experienced conjunctival congestion three days after a colleague tested positive for COVID-19, but before he tested positive himself. Both a throat swab and a conjunctival swab of both eyes detected SARS-CoV-2, the virus that causes COVID-19.

The second subject, a 51-year-old female, began experiencing conjunctival congestion and watery eyes 10 days after she was admitted to the hospital with COVID-19. Physicians were able to detect SARS-CoV-2 in her tears.

In both adult cases, antiviral eye drops helped clear the conjunctivitis symptoms.

According to Kim, research on the subject of conjunctivitis and COVID-19 is ongoing.

“Graefes Archives in Clinical Ophthalmology has a study with 302 patients looking at the frequency and clinical presentation of conjunctivitis in COVID-19,” he says. “Interestingly, [researchers] mention that about 1 in 10 hospitalized patients had conjunctivitis, but did not show any relationship to frequency based on severity of their disease. There are also numerous case series reporting conjunctivitis as the only symptom for COVID 19, although rare.”

Pence May Not Have Pink Eye

Ami A. Shah, MD, a board-certified ophthalmologist and Verywell Health Medical Expert Board member, reminds us that we don’t know for sure if Vice President Pence has conjunctivitis. His red eye could be linked to something unrelated to COVID-19.

“It actually looked like a subconjunctival hemorrhage,” Shah says. “I thought maybe he was getting intravitreal injections for age-related macular degeneration. His pupil looked a little larger on that side, too, like he had been dilated.”

Kim adds irritation may also be the culprit.

“Red, irritated eyes from allergies or exposure to any irritant can be confused with pink eye,” he says.

The information in this article is current as of the date listed, which means newer information may be available when you read this. For the most recent updates on COVID-19, visit our coronavirus news page.