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Time line summarizing immunization history, age at onset of paralysis, and time of specimen collection for the immunodeficient chronic excretor (upper line). The lower line is an expansion of the time line from the patient at age 8 years to 10.1 years showing times (in days after onset of paralysis) of collection of specimens (st, stool specimen; ts, throat swab) found to contain poliovirus type 1 (PV1) iVDPV or echovirus type 7 (E7) or both.
