Russia's Sputnik V vaccine produced antibodies without "serious adverse effects" in early trials, the Lancet study reports.
In the Phase 1 and 2 studies of the vaccine, which is named Sputnik V, all 76 study participants developed antibodies to the virus that causes Covid-19, according to Friday's report in The Lancet.
The levels of neutralizing antibody response were similar to the immune response that people had after naturally recovering from Covid-19, according to the study.
The researchers also looked at responses from T cells, another component of the immune system.
"[Outcomes from] the trial also suggest the vaccines also produce a T cell response within 28 days," the researchers wrote.
However, researchers say longer and larger trials are needed to prove it safe and effective.
