Until complete recovery; i.e., until there are no virus particles left in the blood. (But if the patient dies, his or her corpse remains VERY infectious and must be handled with extreme caution.) The virus lives longer in the reproductive organs, so an infected male may have virus particles that are in his testicals longer than in other organs/parts of the body. This makes his semen infectious for a long period of time (up to 7 weeks).
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