Hepatitis B study in Guinea-Bissau that was to be funded by CDC and that drew global backlash ‘will not move forward’

The US-backed hepatitis B vaccine trial in African newborns that drew global backlash was halted, the lead researcher said on Wednesday.

It was “now clear” that the study “will not move forward in Guinea-Bissau”, Frederik Schaltz-Buchholzer, a Danish researcher, wrote on LinkedIn, adding, “we were not given the necessary governmental approval.”

Police seize doses of hepatitis B vaccine from people at center of dispute over research on African newborns

Controversial vaccine researchers who have been praised by Robert F Kennedy Jr, the US Department of Health and Human Services (HHS) secretary, had their offices in Guinea-Bissau raided by judicial police, who seized doses of hepatitis B vaccines, officials said on Facebook.

The researchers have been at the heart of an ongoing dispute over research on African newborns, supported by $1.6m from the US Centers for Disease Control and Prevention (CDC) and matched by the Pershing Square Foundation and the Bluebell Foundation for a total of $3.2m.

Health minister says government ‘did not authorize’ Danish-led hepatitis B trial in babies backed by RFK Jr

Guinea-Bissau has not approved the controversial hepatitis B study in newborns that would be funded by the US government and private partners, the African country’s minister of health said on Tuesday.

The study, which would not investigate the safety or effectiveness of vaccines but would instead track “nonspecific” health outcomes like overall mortality or neurodevelopmental conditions, has been championed by Robert F Kennedy Jr, secretary of the US Department of Health and Human Services (HHS) and a longtime anti-vaccine activist.

Recommended dose of hepatitis B vaccine will be withheld from thousands of newborns by Danish researchers

A controversial research trial that will withhold hepatitis B vaccines from some African newborns was given approval to move forward this week.

It is a central part of the vaccine vision for Robert F Kennedy Jr, the secretary of the US Department of Health and Human Services (HHS) and a longtime vaccine opponent.

This article was amended on 13 October 2026. A previous version said CIDRAP first reported news that the research trial was approved by the Denmark ethics committee. Rolling Stone had actually reported the news first.