A comparative analysis of B. pertussis DNA content in 351 nasopharyngeal swabs from persons of different age positive in real-time PCR was conducted. The DNA content was measured by quantitative IS481 TaqMan real-time PCR. The content of B. pertussis was significantly higher in infant less than 11 months old (p < 0.05). The mean Ct value in this age group was 32.4 against mean Ct value the values 35.6; 35.0; 37.7; 37.1 in the age groups 1–4, 5–9, 10–14, 15–80 years respectively. The mean Ct value in the PCR positive nasopharyngeal swabs taken in the range of html5-dom-document-internal-entity2-8805-end 15 days of onset of cough were significantly higher compared with swabs taken during the acute phase of the disease (html5-dom-document-internal-entity2-8804-end 14 days) in all age groups except infants. The findings suggest that B. pertussis DNA content in nasopharyngeal swabs is correlated with patient age and that DNA elimination from the nasopharynx of children older age groups, teenagers and adults is more rapid than children of the first year.
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