A second Australian teenager has died of suspected methanol poisoning, bringing to six the number of foreign tourists who have died after apparently drinking tainted alcohol in Laos.

The family of Holly Bowles, 19, said it was with “broken hearts” that they confirmed her death, more than a week after she fell ill in the tourist town of Vang Vieng.

Her friend Bianca Jones, also 19, and British lawyer Simone White, 28, from south-east London, were confirmed to have died on Thursday.

An unnamed US man and two Danish women, aged 19 and 20, are also among the victims of the suspected poisoning, believed to be connected to bootleg alcohol.

In a statement released to media on Friday, Holly’s family said they were taking comfort from the fact she had brought so much “joy and happiness to so many people”.

They added that she had been living “her best life travelling through South East Asia meeting new friends and enjoying incredible experiences” when she became ill.

Australian Foreign Minister Penny Wong said: “All Australians will be heartbroken by the tragic passing of Holly Bowles. I offer my deepest sympathies to her family and friends.”

Holly and Bianca were taken to hospital on Wednesday, 13 November, after they failed to check out of their hostel in the small, riverside town of Vang Vieng, about two hours north of the capital Vientiane.

News reports and testimonies suggest the tourists may have consumed alcohol laced with methanol – a deadly substance often found in bootleg alcohol.

Just a small amount of methanol can be lethal, but it is sometimes added to drinks because it is cheaper than alcohol.

But, as Christer Hogstrand, a professor of molecular ecotoxicology, at King’s College London points out, it is also “not uncommon in home-distilled alcohol”.

“Methanol is like the alcohol in our drinks – colourless and odourless – but its impact on humans can be deadly,” he explained. “It has a different carbon atom structure which completely changes how humans process it in the body, leading to these potentially fatal consequences.”

It is not yet known where any of the people who fell sick or died were poisoned. It can take up to 24 hours for victims to start showing signs of illness.

The Nana Backpacker Hostel – where the Australian teenagers were staying – has said it gave out free shots to around 100 guests the previous evening.

But the hostel’s manager told news agency Associated Press that no other guests had become unwell.

The manager of the hostel has since been detained for questioning by police.

Few details have emerged about any of the other victims and where they may have visited.

Simone White, who lived in Orpington, was reportedly travelling with a group of friends. Ms White was a lawyer with global law firm Squire Patton Boggs, whose work involved general commercial matters, contentious and non-contentious intellectual property law issues according to the firm’s website.

Australia is pushing authorities to be open about their investigation into the incident.

New Zealand and Dutch officials have also both said they were monitoring incidents involving nationals.

Vang Vieng is a hub for backpackers travelling across south-east Asia. It’s home to the Banana Pancake Trail – a popular backpacking route spanning Thailand, Vietnam, Laos and Cambodia.