Table 1.
Study population characteristics.
| Variables | Vaccinated (n = 32) | Unvaccinated (n = 28) |
|---|---|---|
| Mother’s age (years) | 33.3 ± 2.9 (33.6) | 31.7 ± 3.3 (31.5) |
| Child’s age at study enrolment (months) | 8.8 ± 6.8 (6.4) | 10.1 ± 8.7 (7.8) |
| Type of breastfeeding | ||
| 1 Exclusively natural breastfeeding | 14 (43.8%) | 13 (46.4%) |
|
2 (6.3%) | ― |
| 2 Mixed feeding—natural plus modified milk | 2 (6.3%) | 1 (3.6%) |
| 3 Breastfeeding during the expansion of the diet | 7 (21.8%) | 4 (14.3%) |
| 4 Breastfeeding in a child with an extended diet | 9 (28.1%) | 10 (35.7%) |
| Prior SARS-CoV-2 infection | 4 (12.5%) | 12 (42.9%) |
| Time between infection and study enrolment (days) | 94 ± 1.73 (95.0) | 104.4 ± 43.8 (108.5) |
| Infection without symptoms | 1 (3.1%) | 4 (14.3%) |
| Symptoms | ||
| Fever | 0 | 3 (10.7%) |
| Fry cough | 0 | 0 |
| Dyspnea | 0 | 1 (3.6%) |
| Fatigue | 2 (6.2%) | 7 (25%) |
| Headache | 1 (3.1%) | 5 (17.9%) |
| Muscle aches | 2 (6.2%) | 5 (17.9%) |
| Arthralgia | 2 (6.2%) | 5 (17.9%) |
| Chills | 0 | 1 (3.6%) |
| Loss of taste or smell | 2 (6.2%) | 6 (21.4%) |
| Skin rash or discoloration of the fingers and toes | 0 | 0 |
| Feeling unwell | 2 (6.2%) | 5 (17.9%) |
| Sore throat | 2 (6.2%) | 1 (3.6%) |
| AEFI in the mother after each vaccine dose: 1st n(%)/2nd n(%) | 25 (78.1%)/28 (87.5%) | ― |
| Pain at the injection site | 24 (75%)/25 (78.1%) | ― |
| Fatigue | 9 (28.1%)/17 (53.1%) | ― |
| Headache | 10 (31.3%)/18 (56.3%) | ― |
| Muscle aches | 6 (18.8%)/19 (59.4%) | ― |
| Arthralgia | 5 (15.6%)/10 (31.3%) | ― |
| Chills | 3 (9.4%)/14 (43.8%) | ― |
| Fever | 2 (6.3%)/8 (25%) | ― |
| Swelling at the injection site | 4 (12.5%)/6 (18.8%) | ― |
| Redness at the injection site | 5 (15.6%)/4 (12.5%) | ― |
| Nausea | 1 (3.1%)/4 (12.5%) | ― |
| Enlarged lymph nodes | 0/6 (18.8%) | ― |
| Feeling unwell | 6 (18.8%)/18 (56.3%) | ― |
| AEFI in child after each vaccine dose: 1st n(%)/2nd n(%) | 1 (3.1%)/1 (3.1%) | ― |
| Low-grade fever | 0/0 | ― |
| Fever | 0/0 | ― |
| Behavior change | 1 (3.1%)/0 | ― |
| Increased tearfulness | 1 (3.1%)/0 | ― |
| Increased muscle tone | 0/0 | ― |
| Vomiting | 0/0 | ― |
| Diarrhea | 0/0 | ― |
| Other (sleeplessness) | 0/1 (3.1%) | ― |
Data are presented as n (%) or mean ± SD (median).