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Ebola highlights slow progress in war on tropical diseases

11 September 2014, 12:22

London - Some of the world's most gruesome diseases are finally getting a bit of attention.

The worst-ever Ebola outbreak, which has already killed at least 2 296 people in West Africa, has triggered a scramble to develop the first drug or vaccine for a deadly disease that was discovered nearly 40 years ago in the forests of central Africa.

But Ebola is not the only tropical disease without a cure, and many other infections for which effective treatments are lacking or not widely available afflict far larger populations.

The absence of economic incentives for drugmakers to develop and supply medicines for neglected tropical diseases (NTDs) has long been highlighted by health campaigners, but it rarely gets on to the political radar in the West.

Also Read: Sierre Leone expects to uncover 100s of hidden Ebola cases

Out of 336 brand-new drugs approved for all diseases between 2000 and 2011, only four, or 1 percent, were for such conditions - three for malaria and one for diarrhoeal disease, according to a study published in The Lancet journal last year.

The pipeline is also thin, with just 1 percent of clinical trials under way around the world focused on NTDs such as rabies, sleeping sickness, leishmaniasis, elephantiasis, trachoma and other parasites that maim, blind and kill millions.The Ebola outbreak now ravaging West African communities could change those statistics as biotech firms and pharmaceutical companies, spurred on by government funding, fast-track drug development programmes.

"This will draw more attention to Ebola and (neglected) diseases like it, because this is the first time we've seen an outbreak of this magnitude," said Chris Elias, head of global development for the Bill & Melinda Gates Foundation, which has just pledged $50 million to fight the epidemic.

It is not that scientists don't have ideas for new drugs and vaccines but, until now, they have lacked the industry buy-in needed to take experimental products through the costly late stages of clinical development.

Bioweapon fears in West

Significantly, much of the funding for Ebola has been driven not by concerns about sporadic outbreaks in Africa but by a biodefence strategy in the United States and other countries fearful of the potential to weaponise the virus.

There are signs that the threat from neglected diseases is now moving up the agenda but efforts remain woefully inadequate, according to Jean-Herve Bradol, a former president of Medecins Sans Frontieres who leads research at the group's CRASH Foundation research centre and who co-wrote the Lancet paper.

"Unfortunately, we need a major frightening epidemic in a highly developed country to make world leaders understand that they cannot keep on neglecting these infectious diseases," he told Reuters.

Also Read:ECOWAS seeks defenses' intervention in Ebola outbreak

"The neglect has been so long-lasting that if we want to catch up we need much more than a slight improvement."

Bradol said clinical tests on Ebola vaccines - now under way for a shot from GlaxoSmithKline and planned for others from NewLink Genetics and Johnson & Johnson - could have been conducted on healthy volunteers far earlier.

But Ebola has simply not been a priority.

Past outbreaks, while frightening, have killed relatively few people and there have been no recorded Ebola deaths in 22 out of the last 38 years. The disease does not even figure on list of 17 priority NTDs drawn up by the World Health Organisation (WHO) in 2012 that together threaten more than 1 billion people worldwide.

WHO Assistant Director-General Marie-Paule Kieny, a leader in today's Ebola battle, says there has simply not been enough investment in the development of drugs against multiple diseases affecting poor people in poor countries.

Dengue, Malaria vaccine

In a bid to break the logjam, 13 pharmaceutical companies joined the WHO and the Bill & Melinda Gates Foundation at the start of 2012 in a pledge to eradicate or control 10 NTDs by 2020, in part by increased donations of medicines.

There has also been a modest increase in NTD research funding, up 3 percent in 2012 to $3.2 billion after several years of decline, according to the latest annual survey from the group Global Funding of Innovation for Neglected Diseases.

Contributions from governments and charities dominate, with drugmakers chipping in just $527 million - a tiny part of the industry's overall $70 billion research spend - and most of that industry money is targeted at diseases like dengue, malaria and tuberculosis with some commercial upside in the West.

Among individual firms, GSK and Sanofi lead the pack, each investing more than $100 million a year on tropical disease research, according to a Deutsche Bank analysis.

Also Read: US gives ambulances to Sierra Leone to fight Ebola

Both companies are developing vaccines for mosquito-borne diseases - malaria and dengue, respectively - that could be launched late next year.

GSK's malaria shot will be sold on a not-for-profit basis but Sanofi's dengue vaccine is potentially a commercial blockbuster, with the company predicting that annual sales could exceed 1 billion euros ($1.3 billion).

It is a sign that some companies at least are taking a long view when it comes to assessing the customers of the future.

"The tropics are home to 40 percent - and rising - of the world's population," Deutsche Bank said. "Economic growth in the decades ahead will inevitably see many of these nations becoming increasingly important commercially to the pharma industry." (1 US dollar = 0.7744 euro)

- Reuters

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