The warning came as over 7,400 cases of the current outbreak of Ebola have been reported, causing more than 3,430 deaths, according to the World Health Organization. There is widespread transmission of the virus in Guinea, Liberia, and Sierra Leone—the three worst-affected countries—and individual cases have been reported in Nigeria, Senegal, the U.S. and Spain.
The World Bank's report envisaged a scenario called "High Ebola", which sees slow containment of the virus and subsequent contagion across West Africa. It stressed that the economic impact on the three countries worst-affected was already "very serious", and would become "catastrophic under a slow containment, High Ebola scenario."
Read MoreFast-tracking an Ebola vaccine may prove too slow
"With Ebola's potential to inflict massive economic costs on Guinea, Liberia and Sierra Leone and on the rest of their neighbors in West Africa, the international community must find ways to get past logistical roadblocks and bring in more doctors and trained medical staff, more hospital beds, and more health and development support to help stop Ebola in its tracks," Jim Yong Kim, president of the World Bank Group, said in a press release.