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RIO DE JANEIRO, BRAZIL - On Monday, Hong Kong scientists announced the first confirmation of a case of reinfection by Covid-19, the disease caused by the novel coronavirus (Sars-CoV-2). The research with the finding was validated and published in the "Clinical Infectious Diseases" of the Oxford University publishing house in the United Kingdom.

The patient, a 33-year-old man, became infected with the virus for the second time after traveling to Spain. The first time, he had only mild symptoms. The second time, he had no symptoms at all.

In this report, readers will learn, in questions . . .

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