Risk factors for measles among adults in Tianjin, China: Who should be controls in a case-control study?
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DOI: 10.1371/journal.pone.0185465
Abstract: Background Control groups in previous case-control studies of vaccine-preventable diseases have included people immune to disease. This study examines risk factors for measles acquisition among adults 20 to 49 years of age in Tianjin, China,… read more here.
Keywords: igg negative; negative controls; risk; control ... See more keywords