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Vatican City • Mother Teresa, the tiny, stooped nun who cared for the poorest of the poor in the slums of India and beyond, will be declared a saint next year after Pope Francis approved a miracle attributed to her intercession.

The Vatican on Friday set no date for the canonization, but it is widely believed that it will take place in the first week of September to coincide with the 19th anniversary of Mother Teresa's death and during Francis' Holy Year of Mercy.

"With her work, she was always the symbol of mercy, not just with words but with her actions," said the superior general of Mother Teresa's Missionaries of Charity, the Rev. Sebastian Vazhakala.

The Vatican said Francis approved a decree attributing a miracle to Mother Teresa's intercession during an audience with the head of the Vatican's saint-making office on Thursday, his 79th birthday.

The miracle in question concerned the inexplicable cure of a Brazilian man suffering from a viral brain infection that resulted in multiple abscesses. By Dec. 9, 2008, he was in a coma and dying, suffering from an accumulation of fluid around the brain.

The Rev. Brian Kolodiejchuk, the postulator spearheading Mother Teresa's canonization case, said in a statement Friday that 30 minutes after the man was due to undergo surgery, he sat up, awake and without pain. The surgery did not take place and a day later the man was declared to be symptom-free.

The Vatican later attributed the cure to the fervent prayers to Mother Teresa's intercession by the man's wife, who at the time of his scheduled surgery was at her parish church praying alongside her pastor.

"This is fantastic news. We are very happy," said Sunita Kumar, a spokeswoman for the Missionaries of Charity in the eastern city of Kolkata (earlier called Calcutta), where Mother Teresa lived and worked.

Born Agnes Gonxha Bojaxhiu on Aug. 26, 1910, in Skopje, Macedonia, Mother Teresa joined the Loreto order of nuns in 1928. In 1946, while traveling by train from Calcutta to Darjeeling, she was inspired to found the Missionaries of Charity order.

The order was established four years later and has since opened more than 130 houses worldwide to provide comfort and care for the needy, sick and "poorest of the poor."

Mother Teresa won the Nobel Peace Prize in 1979 for her work with Calcutta's destitute and ill — work which continued even after she herself became sick.

"The poor give us much more than we give them," Mother Teresa said in 1977. "They're such strong people, living day to day with no food. And they never curse, never complain."

She died Sept. 5, 1997, at age 87.

At the time, her Missionaries of Charity order had nearly 4,000 nuns and ran roughly 600 orphanages, soup kitchens, homeless shelters and clinics around the world.

While Mother Teresa is known and admired by many around the world, she was not beloved by all. She was criticized for the quality of care in her clinics and for taking donations from Haitian dictator Jean-Claude Duvalier and disgraced American financier Charles Keating.

Detractors also opposed her stance against the use of birth control in Calcutta's slums, which was nevertheless in keeping with church teaching opposing artificial birth control.

Archbishop of Kolkata Thomas D'Souza said the news of the Vatican's decision on Mother Teresa was "the best Christmas gift one can get."