Why There Isn't a Vaccine for Ebola

What's This?

On March 28, 2014, healthcare workers from Doctors Without Borders, react, as they prepare isolation and treatment areas for their Ebola, hemorrhagic fever operations, in Gueckedou, Guinea.

Image: Kjell Gunn Beraas, Medecins Sans Frontieresar /Associated Press

Benjamin Neuman, Virology at University of Reading for The Conversation UK 2014-04-15 19:15:08 UTC

As a virologist, I am often asked when science will come up with a solution to stop deadly viruses, such as the current Ebola outbreak in Guinea. With collaborators, I've helped design and test over a hundred potentially life-saving antiviral drugs. These have led to patents and publications, which are the hallmarks of success in my profession - yet not one of these drugs has ever made it from the lab to market.

Pharmaceutical companies are businesses — they last only as long as they continue to make money. While a new wonder drug may be hugely profitable in the short-term, the financial health of a company depends on its drug development pipeline, the ability to bring a steady flow of new drugs to the market in the long term. And a company is only as strong as its pipeline.

It takes time to dream up ways to attack a virus. Often what appears to be its Achilles heel turns out to be armor plated. Viruses are adaptable and thick-skinned, and have found many various ways to survive millions of years' worth of virus-crushing weaponry.

For every virus-stopping drug that makes it to market, several more will have dropped out during development. And many drugs that work well in sheets of cells that researchers use to grow viruses are completely ineffective in animals. Others go on to fail in people because they cause bad side effects, or are quickly broken down by the body's filter organs. Faced with these difficulties, it is a wonder that we have any new drugs at all.

So, developing new drugs that could treat diseases like Ebola is a financially risky proposition at best, though the results of a recent Ebola treatment trial looked promising.

Counting the cost

The current Ebola outbreak is nearing a hundred deaths in a period of about a month. As shocking as it sounds, if all of those people died in a single day, together with all the victims of SARS, MERS, bird flu, swine flu, and half a dozen viral hemorrhagic fevers, they wouldn't produce a noticeable blip in the daily death statistics. And as deadly as Ebola is, far more in Africa will die of malaria, tuberculosis and the complications of HIV this year.

This is why the early stages of drug and vaccine development are usually undertaken by small groups of scientists working in their own labs, relying on funds by governments, charities or universities. There are many potentially deadly viruses in the world, but few are considered widespread enough to merit the tens to hundreds of millions needed to bring a new vaccine to market. The process works, but it is slow - and practicalities kick in.

There are far more viruses in the world than virologists. We each have to choose what we work on. Self-interest plays a part. Why should the government of a country like the UK expend a large amount of money on Ebola, which only seems to crop up in sub-Saharan Africa? Especially when heart disease and cancer take far more lives both here and throughout the world? Well deadly diseases don't only cost lives.

The economic losses from a virus can be enormous compared to the loss of life. The SARS epidemic of 2002-2003 infected about 8,000 people and claimed around 800 lives. Estimates of economic losses due to restricted trade, travel and heightened surveillance measures range from $40 to $80 billion. For each of the approximately 800 lives lost to SARS, the impact on the world economy was between $50 to $100 million — far greater than the lifetime earning power of the victims.

No hiding place

Globalization means there's no hiding place from deadly viruses. Now that Ebola has spread to the Guinean port city of Conakry, there is more potential for the virus to be accidentally exported around the world. We should take note. Just as SARS was able to spread from China to 36 other countries around the world by commercial airline, there is the potential that Ebola could one day do the same. Mobility drives the spread of infectious diseases. As long as Ebola exists, and keeps crossing over from wildlife to humanity, the threat of a humanitarian disaster will always be there.

Treatments and promising vaccines are stuck in the small science pipeline. The cost of pushing these treatments through the last few sections is a barrier for most charities and ruinous for most private sector companies.

But once we recognize that Ebola (and other viral diseases) threatens the world and not just a small part of Africa, it becomes clear that a global problem demands a global action — from the UN, African Union, G8, NATO, and the EU.