Scientists at the University of Pittsburgh School of Medicine have isolated “the smallest biological molecule” that “completely and specifically neutralizes” the virus that causes COVID-19.

The antibody component is 10 times smaller than a full-size antibody, and has been used to create the drug Ab8, shared in the report published by the researchers in the journal Cell on Monday. The drug is seen as a potential preventative against SARS-CoV-2.

According to the report, the drug has been “highly effective in preventing and treating” SARS-CoV-2 infections in mice and hamsters during tests. The drug also reportedly does not bind to human cells, which suggests it will not have negative side effects in people.