An NIAID-sponsored clinical trial of an experimental vaccine to prevent Lassa fever has begun.

Researchers at the National Institutes of Health (NIH) have determined that dermatitis resulting from topical steroid withdrawal (TSW) is distinct from eczema and is caused by an excess of an essential chemical compound in the body. Scientists from NIH’s National Institute of Allergy and Infectious Diseases (NIAID) identified treatments that could be studied in clinical trials for the condition based on their potential to lower levels of the chemical compound—called nicotinamide adenine dinucleotide (NAD⁺), a form of vitamin B3. The findings were published today in the Journal of Investigative Dermatology.

The antiviral drug tecovirimat used without other antivirals did not reduce the time to clinical resolution of clade II mpox lesions or improve pain control among adults in an international clinical trial sponsored by the National Institutes of Health (NIH). The trial enrollment was stopped in late 2024 when an interim analysis showed that tecovirimat monotherapy was ineffective in the study population. Detailed results were presented at the 2025 Conference on Retroviruses and Opportunistic Infections (CROI) in San Francisco.