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Volume 32, Number 8—August 2026
Research Letter
Kudoa septempunctata Parasite–Associated Foodborne Disease Outbreaks, South Korea, 2015–2024
Seongdae Kim and Byung Chul Chun
Figure
![Interrupted time series analysis of monthly Kudoa septempunctata parasite–associated foodborne disease cases, South Korea, January 2015–December 2024. Blue line, observed monthly counts; red line, model-fitted trend with seasonality removed; dashed vertical line, COVID-19 intervention point (February 2020). The model was a negative binomial regression with a population offset and Fourier terms (K = 2). The level change at COVID-19 onset corresponds to a 95% reduction in monthly cases (β2 = –2.948 [95% CI –3.919 to –1.989]; p<0.001).](/eid/images/26-0653-F1.jpg)
Figure. Interrupted time series analysis of monthly Kudoa septempunctata parasite–associated foodborne disease cases, South Korea, January 2015–December 2024. Blue line, observed monthly counts; red line, model-fitted trend with seasonality removed; dashed vertical line, COVID-19 intervention point (February 2020). The model was a negative binomial regression with a population offset and Fourier terms (K = 2). The level change at COVID-19 onset corresponds to a 95% reduction in monthly cases (β2 = –2.948 [95% CI –3.919 to –1.989]; p<0.001).
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