New York (CNN) -- A mandatory 21-day quarantine imposed by New York and New Jersey on health care workers returning from West Africa after treating Ebola patients caught local and federal officials by surprise and spurred a heated debate on handling the spread of the virus. The policy of isolating medical personnel and others arriving from Ebola-affected countries zones was abruptly implemented Friday by the governors of New York and New Jersey, Andrew Cuomo and Chris Christie. The announcement came one day after a New York doctor who treated patients in Guinea became the first Ebola case diagnosed in the city and the fourth in the United States.
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NEW: Ebola survivor donates plasma to Dr. Craig Spencer
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Doctors Without Borders says there is a ''notable lack of clarity'' in new guidelines
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Health care worker arrived at Newark Liberty International Airport on Friday
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Officials said she developed high temperature after arrival, result from Ebola test came back negative
@placeholder's activities, which include riding in subways and cabs, have sparked a sharp public debate about how to deal with people who have traveled to West African countries ravaged by the disease.