As researchers from Africa to China to America race to develop vaccines and treatments to fight Ebola, health experts are grappling with the economics of a disease that until this year had been off the drug industry's radar.

Whether or not effective drugs come in time to turn around the world's worst epidemic of the virus ravaging three West African countries, the world will want stockpiles to protect against inevitable future outbreaks, experts say.

So a new structure, which some call "Ebolanomics", is needed to revise the business model for a previously neglected disease.

GAVI, the global vaccines alliance, is already working to figure out how to procure a future Ebola vaccine at an affordable price, and drugmakers are considering how much to invest in a disease that, until this outbreak, had infected barely 2,400 people in total in four decades.

Even now Ebola is unlikely to become a big money-spinner for Western pharmaceutical companies, since it afflicts the poor in Africa and the need for medical stockpiles in developed countries will be modest.

Vaccine makers, governments, experts and health agencies are meeting at the World Health Organization's (WHO) headquarters in Geneva on Thursday to come up with some answers.

"What GAVI is going to do is look at all the potential options and ask whether we should create an artificial market," GAVI's chief executive Seth Berkley told Reuters.

That could include making advance commitments to buy so many million doses of a vaccine, with an added incentive of offering a much higher price for the first tranche of any purchase.

"There are no economics now because we do not need a vaccine in the United States or Spain or the UK, though that's not to say people wouldn't buy it right now because people are panicking. The problem is the countries that need it are very, very poor," Berkley said.

Past Ebola outbreaks have killed few people and there have been no recorded Ebola deaths in 22 out of the 38 years since the virus was first identified, helping to explain the limited vaccine effort to date, even though Ebola is a simpler target than notoriously tricky ones like HIV and malaria.

This time, however, according to an analysis by the catastrophe risk management firm RMS, the Ebola epidemic in West Africa has the potential to be the most deadly infectious disease event since the 1918 flu pandemic.

It has already killed nearly 5,000 people, nearly all of them in Liberia, Sierra Leone and Guinea. The WHO believes it can turn the tide if 70 per cent of Ebola patients get treatment or a safe burial, but hitting that tipping point is a challenge.

BETTER PREPARED

Brian Greenwood, a professor of clinical tropical medicine at the London School of Hygiene and Tropical Medicine, said the only sensible response to the worldwide alarm caused by such an epidemic is to be far more ready for the next one.

"We have to be better prepared, the way we are for big flu epidemics or big meningitis outbreaks," he said. "We have to have a stockpile. That's what we do with yellow fever and that's what happens with meningitis, so there is a precedent there."

If they are ready in time and in sufficient doses, there's little doubt effective Ebola vaccines and medicines could make a significant dent in the current deadly epidemic.

Researchers are already testing two candidate vaccines from GlaxoSmithKline and NewLink Genetics, with a third from Johnson & Johnson set to enter human trials in January. Thousands of frontline healthcare workers should start receiving them from the start of next year.

Scaling up to the millions needed for mass immunisation is a project for later in 2015 and will require financial backing from governments and donor organisations, as well as likely indemnity for firms against losses or claims.

Drugmakers and health experts alike never imagined they'd be in this position, so the prospect of an epidemic lasting into 2016 and of demand for drugs for future stockpiles is forcing a major realignment.

"This situation requires new ways of working and thinking," GlaxoSmithKline's chief executive Andrew Witty said this week as he declared his firm will happily work with rivals in what he described as "phenomenal collaboration" in the Ebola fight.

INVESTOR ATTENTION

Investors are taking note, with the shares of small biotech companies most exposed the success or failure of a single product liable to jump and dip on scraps of news suggesting either success or failure.

"In the wake of this catastrophe, there will be drugs, diagnostics and vaccines that are licensed and available," said Rajeev Venkaya, now head of vaccines at Takeda Pharmaceutical and formerly with the Bill & Melinda Gates Foundation.

He expects companies will find a business model that works, helped by development-stage support from governments and donors.

"You can take those costs out of the future cost of goods of commercially produced products, which will of course reduce the price and make it a more sustainable business," he said.

Yet despite fears of greater international spread of the disease, the basics of Ebolanomics remain uncertain.

Realistically, Ebola is unlikely ever to be a big Western market, not even for a traveller vaccine, since visitors to West Africa are even now at very low risk of becoming infected unless they are in frequent close contact with Ebola cases.

This is not like pandemic flu, which spreads like wildfire, prompting governments in the West to stockpile large amounts of vaccines and drugs, leading to windfall profits for drugmakers during the H1N1 pandemic of 2009 and 2010.

Ebola stockpiles, by contrast, will be small and strategic.

"The only way really for an Ebola vaccine to make money long-term is likely to be in a scenario where governments stockpile," said Keith Spencer, a business development analyst atthe Wellcome Trust, an international health charity.

"But we don't have a vaccine yet that we know works, and until you've got a product, it's hard to know whether or not anyone is gong to want to buy it." - Reuters