Anthony Fauci, the renowned former head of the National Institute of Allergy and Infectious Diseases, is currently recovering at home after a nearly week-long hospitalization due to a West Nile virus infection. Fauci, who played a key role in leading the U.S. Covid-19 response, spent six days in the hospital while doctors worked to diagnose his illness. Initially suspected to be a bacterial infection or a tick-borne disease, a blood test revealed that Fauci was “strongly positive” for West Nile virus.

In an interview with STAT, Fauci, 83, shared that he has never been as ill as he was with this recent illness. Describing his symptoms, he said, “I really felt like I’d been hit by a truck. I have to tell you, I’ve never been as sick in my life. Ever. By far, this is the worst I’ve ever been with an illness.”

West Nile virus belongs to the flavivirus family, which includes other viruses like St. Louis encephalitis, Japanese encephalitis, and Powassan virus. There is currently no vaccine available to prevent West Nile virus, nor are there specific antiviral drugs for treatment. Severe cases are managed with supportive care, including intravenous fluids and pain medications.

The virus is primarily transmitted through infected mosquitoes and is the leading cause of mosquito-borne illness in the United States. Cases of West Nile infections tend to peak in August and September, following a cyclical pattern. While the majority of individuals infected with the virus show no symptoms, those who do may experience fever, headache, joint pain, vomiting, and diarrhea. Older adults, especially those aged 60 and above, are at a higher risk of developing serious complications if infected.

In rare cases, the virus can affect the central nervous system, leading to conditions like encephalitis or meningitis. About 10% of individuals who develop neurological complications from West Nile virus may not survive. Fauci mentioned that he did not develop the neurological form of the illness during his recent bout with the virus.

Fauci first started feeling unwell two weeks ago, initially mistaking his symptoms for a common upper respiratory infection. However, his condition worsened, leading to profound weakness and fatigue. He was eventually hospitalized on August 16 after experiencing high fever and shaking chills. Although he has been discharged from the hospital, Fauci admitted that the illness left him extremely weak, requiring assistance to stand at first. He acknowledged that a full recovery will take time, as West Nile virus can have lasting effects on one’s health.

“I just have to rest,” Fauci emphasized. “The good news is I’m absolutely going in the right direction. The sobering news is that it’s going to take weeks and weeks to get back to normal. That’s the history of West Nile. It just wipes you out so badly.”

As Fauci continues his recovery journey, it serves as a reminder of the serious impact that mosquito-borne illnesses like West Nile virus can have on individuals, regardless of their stature in the medical field. It underscores the importance of preventive measures and heightened awareness to combat such diseases effectively.