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UNIVERSAL PRECAUTIONS (BSI) <br />Apply irborne <br />Precautionsor <br />-Disease How Long <br />Anthrax, Inhalation Duration of Illness <br />Chickenpox (Varicella) Until all lesions are <br />crusted. <br />Dyptheria, Pharyngeal Until 2 cultures from <br />both nose and throat <br />after cessation of anti- <br />microbial therapy are <br />negative for Corynebac- <br />terium dipththeriae. <br />Epiglottitis, due For 24 hours after start <br />to Haemophilus of effective antibiotic <br />influenzae . therapy. <br />Erythema infectiosum For 7 days after onset. <br />Hemorrha! ,ic fevers Duration of illness:` <br />*Herpes zoster/ Duration of illness. <br />Varicella Tocalized <br />or disse:ainated. <br />Comments <br />Persons who are <br />not susceptible do <br />no: need to wear a <br />mask. Exposed <br />susceptible <br />patients should be <br />isolated beginning <br />10 days after <br />exposure until 21 <br />days after last <br />exposure. <br />Localized lesions <br />in immunoconpro- <br />mized patients <br />frequently become <br />disseminated. <br />Because such <br />disemination is <br />unpredictable, use <br />the same <br />precautions as for <br />disseminated <br />disease. <br />