Carl Krawitt has watched his son, Rhett, now 6, fight leukemia for the past 4 1/2 years. For more than three of those years, Rhett has undergone round after round of chemotherapy. Last year he finished chemotherapy, and doctors say he is in remission. Now, there's a new threat, one that the family should not have to worry about: measles.Rhett cannot be vaccinated, because his immune system is still rebuilding. It may be months more before his body is healthy enough to get all his immunizations.
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