Table 4.
Maternal vaccination status (Tdap) and characteristics of cases (pertussis-like illness) and controls aged under six months in the Metropolitan Region of Recife.
| Characteristics | Total infants (n = 267) | |
|---|---|---|
| Cases (n = 73) n (%) | Controls (n = 194) n (%) | |
| Infants | ||
| Female | 32 (43.84%) | 107 (55.15%) |
| Male | 41 (56.16%) | 87 (44.85%) |
| Age of infant | ||
| 0 to < 2 months | 29 (39.73%) | 102 (52.85%) |
| ≥ 2 months to < 4 months | 25 (34.25%) | 49 (25.39%) |
| ≥4 months to < 6 months | 19 (27.03%) | 42 (21.76%) |
| Gestational age at birth | ||
| Pre-term | 8 (10,96%) | 5 (2,58%) |
| Term | 60 (82,19%) | 185 (95,36%) |
| Post-term | 5 (6,85%) | 4 (2,06%) |
| Vaccination of infant (DTP) | ||
| Unvaccinated | ||
| Vaccinated | 37 (50.68%) | 79 (45.93%) |
| 36 (49.32%) | 93 (54.07%) | |
| Symptoms | ||
| Cough | ||
| Post cough vomiting | 70 (95,89%) | |
| Cyanosis | 39 (53,42%) | |
| Coryza | 34 (46,57%) | |
| Plethoric face | 26 (35,61%) | |
| Fever 38 °C | 26 (35,61%) | |
| Inspiratory whoop | 22 (30,13%) | |
| Tearing | 12 (16,43%) | |
| Apnea | 8 (10,95%) | |
| 6 (8,21%) | ||
| Diagnosis criteria | ||
| Clinical | 71 (97.26%) | |
| Laboratory | 1 (1.36%) | |
| Clinical epidemiology | 1 (1.36%) | |
| Hospitalization | ||
| Hospitalized | 32 (43,83%) | |
| Not hospitalized | 41 (56,16%) | |
| Hospital stay | ||
| <7 days | 24 (75%) | |
| >7 days | 8 (25%) | |
| Mothers | ||
| Maternal vaccination during pregnancy (Tdap) | ||
| Unvaccinated | 26 (35.62%) | 50 (25.77%) |
| Vaccinated | 47 (64.38%) | 144 (74.23%) |
aX2 Chi-square or Fisher’s tests 1.