Disease Precautionary period
Invasive Haemophilus influenzae type b disease, including meningitis, pneumonia, and sepsis Until 24 hours after initiation of effective therapy
Invasive Neisseria meningitidis disease, including meningitis, pneumonia, epiglottis, and sepsis Until 24 hours after initiation of effective therapy
Diphtheria (pharyngeal) Until off antibiotics and two cultures taken at least 24 hours apart are negative
Mycoplasma pneumoniae infection Duration of illness
Pertussis Until five days after initiation of effective therapy
Pneumonic plague Until 72 hours after initiation of effective therapy
Streptococcal pharyngitis, pneumonia, or scarlet fever in infants and young children Until 24 hours after initiation of effective therapy
Adenovirus infection in infants and young children Duration of illness
Influenza Duration of illness
Mumps For 9 days after onset of swelling
Parvovirus B19 Maintain precautions for duration of hospitalization when chronic disease occurs in an immunocompromised patient. For patients with transient aplastic crisis or red-cell crisis, maintain precautions for 7 days.
Rubella (German measles) Until 7 days after onset of rash