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Table 1 Laboratory results for rubella-specific immunoglobulin M antibody testing of suspected measles cases, 2017–2018, Liberia

From: Rubella transmission and the risk of congenital rubella syndrome in Liberia: a need to introduce rubella-containing vaccine in the routine immunization program

Variables aSuspected measles cases bRubella IgM tested Rubella IgM result
IgM + c (%) IgM - Indeterminate dPositivity %
Total cases 2027 1307 472 769 66 36
Year
 2017 1191 882 353 (75) 478 51 40
 2018 836 425 119 (25) 291 15 28
Sex
 Female 1050 703 269 (57) 404 30 38
 Male 977 604 203 (43) 365 36 34
Age Group
 < 1 Year 81 37 6 (1) 29 2 16
 1–4 Years 525 287 109 (23) 172 6 38
 5–9 Years 647 460 207 (44) 221 32 45
 10–14 Years 329 249 87 (18) 145 17 35
 > 14 Years 420 258 56 (12) 195 7 22
 NA 25 16 7 (1) 7 2 44
Women of Childbearing Age 211 133 23 (5) 106 4 17
  1. aSuspected measles cases with known laboratory result, bsuspected measles cases which are negative and indeterminate for measles IgM and tested for Rubella IgM, cProportion of confirmed rubella cases from total rubella positive cases in each category, dRubella IgM positivity rate was calculated by dividing the number of Rubella IgM positive cases to specimen tested for rubella IgM with specific variables, IgM Immunoglobulin M, NA Not available