TY - JOUR
T1 - Understanding trends in pertussis incidence
T2 - An agent-based model approach
AU - Sanstead, Erinn
AU - Kenyon, Cynthia
AU - Rowley, Seth
AU - Enns, Eva
AU - Miller, Claudia
AU - Ehresmann, Kristen
AU - Kulasingam, Shalini
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Objectives. We examined the impact of undetected infections, adult immunity, and waning vaccine-acquired immunity on recent age-related trends in pertussis incidence. Methods. We developed an agent-based model of pertussis transmission in Dakota County, Minnesota using case data from the Minnesota Department of Health. For outbreaks in 2004, 2008, and 2012, we fit our model to incidence in 3 children's age groups relative to adult incidence. We estimated parameters through model calibration. Results. The duration of vaccine-acquired immunity after completion of the 5-dose vaccination series decreased from 6.6 years in the 2004 model to approximately 3.0 years in the 2008 and 2012 models. Tdap waned after 2.1 years in the 2012 model. A greater percentage of adults were immune in the 2008 model than in the 2004 and 2012 models. On average, only 1 in 10 adult infections was detected, whereas 8 in 10 child infections were detected. Conclusions. The observed trends in relative pertussis incidence in Dakota County can be attributed in part to fluctuations in adult immunity and waning vaccine-acquired immunity. No single factor accounts for current pertussis trends.
AB - Objectives. We examined the impact of undetected infections, adult immunity, and waning vaccine-acquired immunity on recent age-related trends in pertussis incidence. Methods. We developed an agent-based model of pertussis transmission in Dakota County, Minnesota using case data from the Minnesota Department of Health. For outbreaks in 2004, 2008, and 2012, we fit our model to incidence in 3 children's age groups relative to adult incidence. We estimated parameters through model calibration. Results. The duration of vaccine-acquired immunity after completion of the 5-dose vaccination series decreased from 6.6 years in the 2004 model to approximately 3.0 years in the 2008 and 2012 models. Tdap waned after 2.1 years in the 2012 model. A greater percentage of adults were immune in the 2008 model than in the 2004 and 2012 models. On average, only 1 in 10 adult infections was detected, whereas 8 in 10 child infections were detected. Conclusions. The observed trends in relative pertussis incidence in Dakota County can be attributed in part to fluctuations in adult immunity and waning vaccine-acquired immunity. No single factor accounts for current pertussis trends.
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U2 - 10.2105/AJPH.2015.302794
DO - 10.2105/AJPH.2015.302794
M3 - Article
C2 - 26180973
AN - SCOPUS:84939173664
SN - 0090-0036
VL - 105
SP - e42-e47
JO - American journal of public health
JF - American journal of public health
IS - 9
ER -
