Walking back to the hospital, she says the patient has classic symptoms of cholera.
Aid workers say cholera and other diseases are killing dozens of people every day.
Cholera also affected parts of Latin America following flooding along the Pacific Coast and southern Brazil.
Diseases that can be detected by direct sequencing include cholera, tuberculosis, HIV, typhoid, flu and anthrax.
Cholera could also be a problem, but the disease is not endemic on the island.
Traditionally, scientists what was causing a clear and undeniable case of illness like cholera.
As ever after such events, an outbreak of waterborne diseases such as cholera is feared.
Cholera is endemic, it said, and threatens to worsen without latrines and clean water.
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Before she fell sick, Yudermis had never even heard of cholera, which is rare in Cuba.
They have no running water or sanitation dysentery and even cholera are real risks and no income.
Tents have been set up and packed with cots and IVs for cholera patients.
The mayor of St Marc, where cholera first appeared, authorised a centre last month.
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This simple idea has saved millions of lives -- not just from cholera, but from any diarrhea.
The government should declare the cholera outbreak a national disaster and solicit international assistance, the group said.
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But the spread of cholera across the Limpopo river into South Africa has intensified the debate there.
Mugabe's government has declared the cholera epidemic a national emergency and called on international organizations for help.
The force became hugely unpopular after an outbreak of cholera, which Haitians said blamed on foreign peacekeepers.
But the lawyers acting for Haiti's cholera victims say they don't want charity - they want justice.
The UN wants funds for emergency cholera treatment and for clean water supply systems and sewage plants.
Time might cause problems of its own if cholera gets a foothold inside South Africa as well.
Health authorities are probably mindful of a cholera epidemic that swept through Penang in May last year.
The government has at last begun a concerted campaign to educate Haitians about cholera and its treatment.
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Doctors say that cholera has not yet peaked and is likely to last months, if not years.
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"For the first time in the history of (the doctor's) island, no one died of cholera, " Stachel said.
Drinking contaminated water can lead to cholera, vomiting, diarrhea and other ailments that can quickly incapacitate and kill.
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Meanwhile, floods which affected Africa in late 1997 led to upsurges of cholera, malaria and Rift Valley fever.
Diseases once thought to be conquered in the modern world are reappearing in Russia, including cholera and diphtheria.
In addition, a cholera epidemic sweeping the country has claimed several lives and spread to neighboring South Africa.
The source has been identified as a foodseller who caught cholera during a previous outbreak in eastern Cuba.
The sheriff, Isaac (Ben Browder), wants to protect Jex, who had previously saved Mercy from a cholera epidemic.
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