Hunting a killer virusAs more Angolans die from an Ebola-type virus, Fred Bridgland in Johannesburg talks to one of the scientists who risk everything to seek the origins of this horrific and terrifying disease
They are the Indiana Joneses of virus hunting. As the death toll mounts in the rare but deadly Marburg fever outbreak in northern Angola, they are winging in from Geneva, Atlanta and Johannesburg and other points on the compass where virologists maintain their labs.
Their mission initially is to stem the flow of deaths from the haemorrhagic fever, which causes uncontrollable and massive bleeding and for which there is no known cause or cure. Some 180 people have died so far, including a 51-year-old Italian paediatrician, Maria Bonino, who was at the heart of the initial effort to save lives in the Angolan town of Uige.
Red-headed and bear- hugging Mike Ryan, director of the World Health Organisation’s (WHO) alert and response operations, is on his way. So is Bob Swanepoel, director of South Africa’s National Institute for Communicable Diseases. They are among the world’s leading virus-busters and will be hoping to meet up with their old buddy Dr Anthony Sanchez, a quiet Texan who has spent most of his career studying the Marburg virus and its close virus relative, Ebola, in his laboratories at the United States Centres for Disease Control and Prevention in Atlanta, Georgia.
They have all worked together in the field before in Uganda and the Congo in the most trying of circumstances, because Marburg and Ebola seem to break out in the most remote, undeveloped, war-torn and corrupt parts of Africa.
The virus-busters have buried nurses after they died in agony. They have seen fellow doctors die because of a split second of slackness while fighting these gruesome diseases which liquefy the internal organs. Marburg and Ebola do not forgive even the tiniest mistake. Bodies of their victims have been described as the most lethal things on Earth: touching one can be like slapping a live grenade.
Goatee-bearded Swanepoel, among the most swashbuckling of the virus-busters and still energetic at the age of 66, was arrested by police in the Congo while trapping bats he thought might carry the Ebola virus: he was able to get out of jail only after the army colonel who could vouch for him had been hauled from the local brothel.
As they don their white space suits to fight Marburg in the forests and abandoned coffee plantations of northern Angola, they are also excited about another rare opportunity to find the cause of the disease. While burying the dead they will be drawing blood and taking skin samples with a special biopsy punch to be sealed in sterile bottles and sent, packed in dry ice, to their laboratories thousands of miles away.
Swanepoel, despite decades spent tramping through the jungles and savannahs in search of the original reservoirs from which the Marburg and Ebola viruses emerge, still does not know the answer.
“Is it in bushmeat? A monkey? A bat? You could test 100,000 mosquitoes or even a million mosquitoes before you find it, because perhaps it’s only a limited number of the little brutes that carry the virus,” he said. “The fact is that we’ve discovered 500 known viruses since we began isolating them in the last century, and we’ve pegged only 26 to disease.
“But the unknown ones in Africa’s forests run into the tens of thousands. Africa is going to keep us busy for a while yet.”
Swanepoel has collected thousands of monkey, bat, rat, insect and plant samples in search of the scientists’ Holy Grail – the “reservoir” where the Marburg and Ebola viruses lurk, dormant and hidden, waiting for the right moment for their next deadly attack.
He thought he was close to locating the precise hiding place of the Marburg virus in 1999 when it killed scores of people in Durba, a rebel-held town in northeast Congo where a hardly legal Canadian gold-mining operation had disturbed huge swathes of rain forest. Miners were dropping dead in tunnels fouled with bat excrement and their surviving colleagues were working right on top of the bodies, which had been buried on the spot.
Swanepoel is known as “Batman” among the virus-busters because he is convinced the winged mammals are crucial to the transmission of the Marburg and Ebola viruses, but has yet to prove his theory. He has caught and tested thousands of bats in Africa hasn’t located either of the killer viruses. He believes they may lurk in bats in very precise conditions – for example, bats hanging from a cave roof at a critical temperature. Or they may be hidden in a particular insect – of which there are trillions in Africa – that the bats eat from time to time.
Still the search goes on, and Dr Pierre Rollin, a colleague of Dr Sanchez in Atlanta, has observed: “We don’t know where the viruses hide. It may turn out to be something right under our noses. There are different schools of thought, and Bob is in the bat school. The problem is that the viruses just vanish as soon as a short and deadly epidemic burns itself out.”
So the virus-busters are searching hard as the death toll from Angola’s Marburg outbreak increases by the day.
Quite apart from the risk of proximity to the dead and dying, they face the usual cocktail of hazards found in outlying areas of Africa. Some of WHO’s mobile surveillance teams in Uige province have been forced to suspend operations after their vehicles were attacked and damaged by local residents, who are accusing the virus-busters of killing people who had been taken away sick and returned to them dead.
The Angolan government in the capital Luanda, 200 miles away, has dispatched soldiers to the province but they have neither the knowledge nor the skills to educate an increasingly terrified populace.
Marburg is a rarer but deadlier relative of the better-known Ebola virus. It was named after the German town where it was first identified in 1967, when monkeys imported from Uganda infected and killed scientists researching TB.
Before the present crisis, the worst outbreak of Marburg occurred between 1998 and 2000 in DR Congo, where it killed 123 people. That was also the last known outbreak before the latest flare-up, which is bigger than any known Ebola attack.
“This one is becoming a huge problem,” said Dick Thompson, a WHO spokesman whose surveillance teams have fanned out all across northern Angola. “We clearly don’t know the dimensions of the outbreak.”
The secret in stopping the epidemic is to prevent as many person-to-person contacts as possible. The virus spreads on contact with bodily fluids such as blood, urine, excrement, vomit, saliva and even perspiration.
Symptoms include diarrhoea, stomach pains, nausea and vomiting, giving way to death by massive, uncontrollable and widespread bleeding.
Bob Swanepoel and the rest of the virus-busters may or may not find the virus reservoir this time, but a frightening prospect is that WHO and other global authorities are certain that new Marburg and Ebola-like diseases are on the way.
The reason? As we begin cultivating even the most inaccessible and unspoilt regions, we disturb viruses that have been isolated for hundreds of thousands of years.
As Africa’s growing population continues to push into tropical eco systems, encouraged by ruthless international logging firms, then countless more people will flounder into the ancient webs of parasitism long established between unknown viruses and animals, and thus unwittingly become hosts themselves.
As he set out again with his vast array of trapping nets, UV light traps, fogging machines, slingshots and live traps, Batman Swanepoel said: “I sure hope one of us finds out where these diseases hide in the forests when they’re not out killing people. It’d be a hell of a relief. We could all get a life.”
10 April 2005
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