Ebola, caused by ebolaviruses, has infected more than 25,000 people in West Africa since December 2013. Now, for the first time, the virus has been found inside the eyes of a patient. The virus has been found several months after the virus went from his blood.

According to reports, the new discovery concerned the 43-year-old Dr. Ian Crozier. Crozier is a physician in the United States who was diagnosed with Ebola in September last year when the doctor was working with the World Health Organization in Sierra Leone.

The doctor was treated at Emory University Hospital’s special Ebola unit in Atlanta. Crozier was released in October last year when Ebola was not present in his blood. According to reports, about two months later, the doctor developed an irritation and high blood pressure in one eye, which further caused swelling and vision problems.

After that, the doctor returned to Emory, where Dr. Steven Yeh, an ophthalmologist, exhausted some of the fluid and then tested it for Ebola. As per the reports, the fluid had the virus, but tissue and tears around the outside of the doctor’s eye did not.

The report stated that a casual contact with an Ebola survivor did not pose any public health risk. It also showed that survivors should be monitored for the eye problem, according to Yeh. Crozier has not fully recovered his vision, but it is continuously improving, Yeh added.

Dr. Jay Varkey, an Emory infectious disease specialist, said, “Those involved in Crozier’s care wore recommended protective gear and monitored themselves for Ebola symptoms for several weeks afterward as a precaution.”

On Thursday, the World Health Organization announced that the number of cases of Ebola reported in Sierra Leone and Guinea last week dropped to its lowest total in 2015.