EDITORIAL: WHO right to insist that all Ebola vaccines remain within strict clinical trials

The World Health Organization’s decision to restrict the use of the Ervebo Ebola vaccine to controlled clinical trials in the current outbreak is a timely reminder that urgency must never outrun evidence in public health emergencies.

The vaccine, which is the world’s only licensed Ebola shot, was developed to protect against the Zaire strain of the virus. The current outbreak, however, is driven by the Bundibugyo strain. That distinction is not academic—it is decisive. A vaccine designed for one strain cannot be assumed to work against another, no matter how similar the diseases may appear on the surface.

Ervebo was partly tested in Kenya nearly a decade ago in Kilifi county, where about 40 volunteers participated in early safety studies. Those trials established safety and immune response, but not outbreak effectiveness. That gap matters today.

WHO is right to insist that all Ebola vaccines and treatments under consideration remain within strict clinical trials. In the heat of an outbreak, the temptation to deploy available tools is understandable. But history has shown that untested assumptions can undermine both trust and outcomes.

At the same time, WHO’s guidance is not a retreat from action. It is a call for disciplined science. Experimental vaccines, monoclonal antibodies and antivirals are all being assessed, but none are yet ready for indiscriminate use.

The real lesson is that outbreak control still depends on basics: surveillance, rapid testing, isolation, contact tracing, infection prevention and safe burials. These are not outdated tools; they remain the backbone of Ebola response.

As research accelerates, governments and partners must resist the pressure for shortcuts. In epidemics, the fastest response is not always the safest one. What saves lives in the long term is evidence, discipline and public trust.

Quote of the Day: “It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.” —US President Franklin D Roosevelt on June 2, 1933, authorised the first swimming pool built inside the White House