Volume 31, Number 1—January 2025
Research Letter
Low IgG Seroconversion among Persons Vaccinated against Measles, Republic of Congo
Yanne Vanessa Thiécesse Mavoungou, Léa Gwladys Gangoué, Félix Koukouikila-Koussounda, Cynthia Badzi Nkoua, Pembe Issamou Mayengue, Jean-Medard Kankou, Pathou Christelle Kiminou, Princesse Mahoukou, Louis Régis Dossou-Yovo, Gabriel Ahombo, and Fabien Roch Niama
Table
IgG seroconversion status in study of low IgG seroconversion among persons vaccinated against measles, Republic of Congo*
| Variables | IgG positive | IgG negative | p value |
|---|---|---|---|
| Total no. patients |
74 (38.7) |
117 (61.3) |
<0.0001 |
| Age group, y | |||
| Median age (IQR) | 5 (3–7) | 4 (2–6) | 0.3956 |
| ˂5 | 36 (35.6) | 65 (64.4) | <0.0001 |
| 5–9 | 26 (40) | 39 (60) | 0.0226 |
| >10 |
12 (48) |
13 (52) |
0.7773 |
| Patient sex | |||
| M | 34 (39.1) | 53 (60.9) | 0.004 |
| F |
40 (38.5) |
64 (61.5) |
0.0009 |
| Vaccination status | |||
| 1 dose | 57 (38) | 93 (62) | <0.0001 |
| >2 doses |
17 (41.5) |
24 (58.5) |
0.1221 |
| Interval between last vaccination and disease onset, mo | |||
| Median interval (interquartile range) | 30 (5–60) | 19 (3–51) | 0.1957 |
| Unknown | 9 (31) | 20 (69) | 0.0039 |
| 2–48 | 42 (37.8) | 69 (62.2) | 0.0003 |
| >48–108 | 15 (38.5) | 24 (61.5) | 0.0415 |
| >108 |
8 (66.7) |
4 (33.3) |
0.1025 |
| Municipality | |||
| Urban | 43 (33.6) | 85 (66.4) | <0.0001 |
| Rural | 31 (49.2) | 32 (50.8) | 0.8586 |
*Values are no. (%) except as indicated.
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