A ‘biblical’ virus named HTLV-1, believed to be the ancient cousin of HIV, has swept across Northern Australia infecting thousands of resident with leukemia and lymphoma.
CNN reports: Many doctors — including the man who discovered the virus nearly four decades ago — are raising the alarm about how little has been done to prevent, test for and treat HTLV-1, which can cause leukemia and lymphoma.
“The prevalence is off the charts” in Australia, said Dr. Robert Gallo, co-founder and director of the Institute of Human Virology at the University of Maryland School of Medicine, whose laboratory was the first to detect HTLV-1 in 1979 and publish the finding in 1980.
Yet “nobody that I know of in the world has done anything about trying to treat this disease before,” said Gallo, who is also co-founder and scientific director of the Global Virus Network and chairs the network’s HTLV-1 Task Force.
“There’s little to almost no vaccine efforts, outside of some Japanese research,” he said. “So prevention by vaccine is wide open for research.”
HTLV-1 — an ancient virus whose DNA can be found in 1,500-year-old Andean mummies — can spread from mother to child, particularly through breastfeeding; between sexual partners, through unprotected sex; and by blood contact, such as through transfusions. Because it can be transmitted through sex, it’s considered a sexually transmitted infection, or STI.
The virus is associated with myriad serious health problems, such as diseases of the nervous system and a lung-damaging condition called bronchiectasis, and it weakens the immune system. HTLV-1 is sometimes called a cousin of the human immunodeficiency virus, HIV.
An ‘extraordinary’ prevalence in remote Australia
The focus has come about now because of the high prevalence among indigenous Australians, “which is probably the highest-ever reported prevalence in any population,” said Dr. Graham Taylor, a clinician and professor at Imperial College London who runs the United Kingdom’s HTLV clinical service based at St. Mary’s Hospital.
“But if we look globally, we know about HTLV-1 in a number of countries,” he added.
HTLV-1 is present throughout the world, but there are certain areas where it is highly endemic, such as the rare isolated cluster in central Australia.
The main highly endemic areas are the southwestern part of Japan; some parts of the Caribbean; areas in South America including parts of Brazil, Peru, Colombia and French Guyana; some areas of intertropical Africa, such as south Gabon; some areas in the Middle East, such as the Mashhad region in Iran; a region in Romania; and a rare isolated cluster in Melanesia, according to the European Centre for Disease Prevention and Control.
Elsewhere in the world, such as in the United States and the UK, prevalence remains low.
“The interesting thing about central Australia, of course, is you can go back 25 years, and the high rates of HTLV-1 were published 25 years ago in that community,” Taylor said.
Indeed, a study published in the Medical Journal of Australia in 1993 found that HTLV-1 was endemic among natives in inland Australia, with a high 13.9% prevalence in the Alice Springs area.
It’s unclear whether the sample in that old study was of the same population currently experiencing a higher prevalence rate, and it’s unclear whether that previous rate was measured with similar methods used to assess prevalence today.
Nonetheless, the current prevalence rate, exceeding 40%, is “extraordinary,” Taylor said.
“It’s causing a problem of bronchiectasis. People are dying of bronchiectasis in association with HTLV-1 infection, and what is the response? If you can’t see a response, then you might say it’s neglected,” he said. “The virus is neglected, and the diseases that it causes are neglected.”
The reason why HTLV-1 prevalence in an already endemic area is exceeding 40% remains something of a mystery, Gallo said.
While musing on possible reasons, he questioned whether the HTLV-1 seen among indigenous communities in central Australia could be a variant that transmits more easily.
“Nobody knows that either,” he said. “That’s possible.”
However, he added, there is no reason for the rest of the world to be concerned about the virus spreading more widely.
Likely, “this virus, I don’t care what the variation is, will not transmit casually,” Gallo said.
“In short, I would not be afraid to use towels, drink out of the same glass, be part of the family, et cetera,” of an HTLV-1 positive person, he said. But he added that the virus certainly can transmit through breastfeeding, blood contact and sex.
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