
The woman was being monitored at the Bamrasnaradura Infectious Diseases Institute and given the good news after a second blood test conducted by Chulalongkorn University came up negative.
She arrived in Bangkok last Wednesday from Liberia and feared she may have been infected.
According to the World Health Organisation, Ebola outbreaks have occurred in Guinea, Liberia, Sierra Leone, Nigeria and the Democratic Republic of the Congo.
In the Congo, one of two people who tested positive had the Sudanese strain of the disease, while the other person had a mix of the Sudanese and the Zaire strains – the latter being the most lethal.