Table 2. Description of pertussis cases, France, 2017–2020 (n = 132).
| Characteristics | Number (n = 132) |
% | |
|---|---|---|---|
| Type of confirmation | |||
| Laboratory-confirmed case | 109 | 83 | |
| Epidemiologically-confirmed case | 23 | 17 | |
| Demographic parameters | |||
| Median age (min–max; IQR) | 31.5 years (2 months–87 years; 39 years) | ||
| Sex | Women | 83 | 63 |
| Men | 49 | 37 | |
| Clinical description | |||
| Presence of fever (as assessed by GP) | 34 | 26 | |
| Hospitalisation | 4 | 3 | |
| Cough | 132 | 100 | |
| Predominantly nocturnal | 101 a | 79 | |
| Cough with cough attacks | 122 a | 92 | |
| Cough with frequent post-cough vomiting | 39 a | 30 | |
| Cough leading to difficult breathing | 54 a | 41 | |
| Cough with cyanosis | 5 a | 4 | |
| Whooping cough | 27 a | 21 | |
| Apnoea | 15 | 12 | |
| Immunisation status | |||
| Not vaccinated | 54 | 48 | |
| Vaccinated | 58 | 52 | |
| Unknown number of doses | 21 | 36b | |
| Known number of doses | 37 | 64b | |
| 1 dose | 1 | 3c | |
| 2 doses | 1 | 3c | |
| 3 doses | 8 | 22c | |
| 4 doses | 13 | 35c | |
| > 4 doses | 14 | 38c | |
| Laboratory criteria | |||
| Culture prescribed | 6 | 5 | |
| Culture performed | 6 | 100d | |
| Culture positive | 6 | 100e | |
| PCR prescribed | 112 | 85 | |
| PCR performed | 110 | 99f | |
| PCR positive | 103 | 94g | |
GP: general practitioner; IQR: interquartile range; max: maximum; min: minimum.
Missing data: Three (2%) for fever, four (3%) for ‘Predominantly nocturnal cough‘, two (2%) for ‘Cough with frequent post-cough vomiting‘, one (1%) for ‘Cough leading to difficult breathing‘, eight (6%) for ‘Cough with cyanosis‘, six (5%) for ‘Whooping cough‘, eight (6%) for ‘Cough with apnoea‘, four (3%) for hospitalisation, 20 (15%) for immunisation status, 21 of 58 (36%) for number of vaccine doses, one (1%) for PCR prescription, one of 112 (1%) for PCR performed, five (4%) for culture prescription.
a Several characteristics can describe a same case, so the sum of characteristics exceeds the total number of cases.
b The percentage is based on the total number of cases who were vaccinated (n = 58).
c The percentage is based on the total number of cases with known number of vaccine doses received (n = 37).
d The percentage is based on the total number of cases for whom culture was prescribed (n = 6).
e The percentage is based on the total number of cases for whom culture was performed (n = 6).
f The percentage is based on the total number of cases for whom PCR was prescribed (n = 112).
g The percentage is based on the total number of cases for whom PCR was performed (n = 110).