It is believed at least 12 others fell ill, requiring hospital treatment, including travellers from the UK, the United States and New Zealand.
All the victims were staying at the Nana Backpacker Hostel, and their deaths have been linked to both the hostel and Jaidee Bar, a nearby watering hole.
The backpackers were seen returning from the bar to the hostel on Nov 12, the day before a number were found unconscious in their rooms.
Ten days later, the Laos government confirmed methanol contamination in the guesthouse’s beverages.
While unofficial reports suggested both the hostel owner and manager had been detained, three sources in Vang Vieng told The Telegraph that only Yueng Van Huan, the Vietnamese manager, was in custody.
Mr Huan told ABC News (Australia) that he is certain the poisoned drinks were not sold at the Nana Backpacker Hostel bar.
He also strongly denied adding methanol to the drinks at the hostel’s bar, and said police had checked his business.
The authorities have yet to respond to requests for comment.