International Conference on Aids: Strain of virus may affect transmission

AIDS scientists are investigating the possibility that a particular HIV strain is more likely to be transmitted through heterosexual sex than another route such as a blood transfusion.

If such forms of the virus exist it could explain why some parts of the world, such as Africa, have a heterosexual Aids epidemic, while elsewhere the virus is prevalent among drug users but is failing to reach the heterosexual population as quickly as predicted.

Two distinct types of the HIV-1 virus have been identified in Thailand in two groups who contracted it in a different way. More than 80 per cent of those infected heterosexually had a Type A virus (mainly in northern Thailand) while 76 per cent of those infected through injecting drugs had Type B. Type A is related to HIV found in Central Eastern Africa while Type B is related to that occurring in northern Europe and the US.

Dr Chin-Yih Ou, of the Centres for Disease Control, Atlanta, said it was 'very, very unusual' to have such segregation of viral types. 'We do not fully understand the reason for this segregation. It could be that there is little high risk contact between drug users and prostitutes and the HIV epidemic is occurring quite separately in these groups. Or more speculatively, there may be biological differences in the degree of transmission of the two sub- types.' In other words one type may be adapted to transmission through blood, while the other sub-type is more likely to be transmitted through heterosexual intercourse.

Thailand was the first country in Asia to be affected by the HIV pandemic, beginning in 1988.

Suggested Topics
Start your day with The Independent, sign up for daily news emails
Arts and Entertainment
The Doctor and Clara have their first real heart to heart since he regenerated in 'Deep Breath'
TV
Life and Style
Apple showed no sign of losing its talent for product launches with the new, slightly larger iPhone 6 making headlines
techSecurity breaches and overhyped start-ups dominated a year in which very little changed (save the size of your phone)
Arts and Entertainment
Jamie Oliver
filmTV chef Jamie Oliver turned down role in The Hobbit
News
The official police photograph of Dustin Diamond taken after he was arrested in Wisconsin
peopleDownfall of the TV star charged with bar stabbing
PROMOTED VIDEO
Have you tried new the Independent Digital Edition apps?
ebooks
ebooksA year of political gossip, levity and intrigue from the sharpest pen in Westminster
Arts and Entertainment
Jeremy Clarkson, left, and Richard Hammond upset the locals in South America
tvReview: Top Gear team flee Patagonia as Christmas special reaches its climax in the style of Butch and Sundance
News
people
Sport
Ashley Barnes of Burnley scores their second goal
footballMan City vs Burnley match report
Arts and Entertainment
Peter Mayhew as Chewbacca alongside Harrison Ford's Han Solo in 'Star Wars'
film
News
i100
Arts and Entertainment
Man of action: Christian Bale stars in Exodus: Gods and Kings
film
Arts and Entertainment
Tracy Emin's 1998 piece 'My Bed' on display at Christie's
artOne expert claims she did not
News
Ernesto Che Guevara and Fidel Castro, right, met at Havana Golf Club in 1962 to mock the game
newsFidel Castro ridiculed the game – but now investment in leisure resort projects is welcome
News
Hackers revealed Oscar-winning actress Lawrence was paid less than her male co-stars in American Hustle
people
Arts and Entertainment
Clueless? Locked-door mysteries are the ultimate manifestation of the cerebral detective story
booksAs a new collection of the genre’s best is published, its editor explains the rules of engagement
Sport
Robin van Persie is blocked by Hugo Lloris
footballTottenham vs Manchester United match report
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Recruitment Genius: Business Manager

£32000 - £40000 per annum: Recruitment Genius: A Business Manager is required ...

Recruitment Genius: Operations Manager

£45000 - £55000 per annum: Recruitment Genius: This is an exciting opportunity...

Recruitment Genius: Panel & Cabinet Wireman

£20000 per annum: Recruitment Genius: Panel Wireman required for small electro...

Recruitment Genius: Electronics Test Engineer

£25000 - £27000 per annum: Recruitment Genius: An SME based in East Cheshire, ...

Day In a Page

A timely reminder of the bloody anniversary we all forgot

A timely reminder of the bloody anniversary we all forgot

Who remembers that this week we enter the 150th anniversary year of the end of the American Civil War, asks Robert Fisk
Homeless Veterans appeal: Former soldiers pay their respects to a friend who also served

Homeless Veterans appeal

Former soldiers pay their respects to a friend who also served
Downfall of Dustin 'Screech' Diamond, the 'Saved By The Bell' star charged with bar stabbing

Scarred by the bell

The downfall of the TV star charged with bar stabbing
Why 2014 was a year of technological let-downs

Why 2014 was a year of technological let-downs

Security breaches and overhyped start-ups dominated a year in which very little changed (save the size of your phone)
Cuba's golf revolution: But will the revolutionary nation take 'bourgeois' game to its heart?

Will revolutionary Cuba take 'bourgeois' golf to its heart?

Fidel Castro ridiculed the game – but now investment in leisure resort projects is welcome
The Locked Room Mysteries: As a new collection of the genre’s best is published, its editor Otto Penzler explains the rules of engagement

The Locked Room Mysteries

As a new collection of the genre’s best is published, its editor explains the rules of engagement
Amy Adams on playing painter Margaret Keane in Tim Burton's Big Eyes

How I made myself Keane

Amy Adams hadn’t wanted to take the role of artist Margaret Keane, because she’d had enough of playing victims. But then she had a daughter, and saw the painter in a new light
Ed Richards: Parting view of Ofcom chief. . . we hate jokes on the disabled

Parting view of Ofcom chief... we hate jokes on the disabled

Bad language once got TV viewers irate, inciting calls to broadcasting switchboards. But now there is a worse offender, says retiring head of the media watchdog, Ed Richards
A look back at fashion in 2014: Wear in review

Wear in review

A look back at fashion in 2014
Ian Herbert: My 10 hopes for sport in 2015. Might just one of them happen?

Ian Herbert: My 10 hopes for sport in 2015

Might just one of them happen?
War with Isis: The West needs more than a White Knight

The West needs more than a White Knight

Despite billions spent on weapons, the US has not been able to counter Isis's gruesome tactics, says Patrick Cockburn
Return to Helmand: Private Davey Graham recalls the day he was shot by the Taliban

'The day I was shot by the Taliban'

Private Davey Graham was shot five times during an ambush in 2007 - it was the first, controversial photograph to show the dangers our soldiers faced in Helmand province
Revealed: the best and worst airlines for delays

Revealed: the best and worst airlines for delays

Many flyers are failing to claim compensation to which they are entitled, a new survey has found
The stories that defined 2014: From the Scottish independence referendum to the Ice Bucket Challenge, our writers voice their opinions

The stories that defined 2014

From the Scottish independence referendum to the Ice Bucket Challenge, our writers voice their opinions
Stoke-on-Trent becomes first British city to be classified as 'disaster resilient' by the United Nations

Disaster looming? Now you know where to head...

Which British city has become the first to be awarded special 'resilience' status by the UN?