Johnson & Johnson Single-Shot COVID-19 Vaccine Shows 66% Efficacy in Trials

Johnson & Johnson on Friday said its single-shot vaccine has been found to be 66 percent effective overall at preventing moderate to severe Covid-19, 28 days after vaccination, in phase 3 trials.

The level of protection against moderate to severe Covid-19 infection was 72 percent in the US, 66 percent in Latin America and 57 percent in South Africa, 28 days post-vaccination, the company said. The onset of protection was observed as early as day 14.

“Our goal all along has been to create a simple, effective solution for the largest number of people possible, and to have maximum impact to help end the pandemic,” Alex Gorsky, Chairman, Board of Directors and Chief Executive Officer, Johnson & Johnson, said in a statement.

“We’re proud to have reached this critical milestone and our commitment to address this global health crisis continues with urgency for everyone, everywhere.” The vaccine candidate was 85 percent effective in preventing severe disease across all regions studied, 28 days after vaccination in all adults 18 years and older.

Efficacy against severe disease increased over time with no cases in vaccinated participants reported after day 49, the company said. Significantly, the Covid-19 vaccine candidate demonstrated complete protection against Covid-related hospitalization and death, 28 days post-vaccination. There was a clear effect of the vaccine on Covid-19 cases requiring medical intervention with no reported cases among participants who had received the Janssen Covid-19 vaccine, 28 days post-vaccination.

“These topline results with a single-shot Covid-19 vaccine candidate represent a promising moment,” said Paul Stoffels, Vice Chairman of the Executive Committee and Chief Scientific Officer, Johnson & Johnson. “The potential to significantly reduce the burden of severe disease, by providing an effective and well-tolerated vaccine with just one immunization, is a critical component of the global public health response.”