A Nationwide Observational Study of Chlamydia trachomatis Infections in Denmark during the COVID-19 Pandemic
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A Nationwide Observational Study of Chlamydia trachomatis Infections in Denmark during the COVID-19 Pandemic. / Hedley, Paula L; Hoffmann, Steen; Lausten-Thomsen, Ulrik; Voldstedlund, Marianne; Bjerre, Karsten Dalsgaard; Hviid, Anders; Krebs, Lone; Jensen, Jørgen S; Christiansen, Michael.
In: Acta Dermato-Venereologica, Vol. 102, adv00704, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A Nationwide Observational Study of Chlamydia trachomatis Infections in Denmark during the COVID-19 Pandemic
AU - Hedley, Paula L
AU - Hoffmann, Steen
AU - Lausten-Thomsen, Ulrik
AU - Voldstedlund, Marianne
AU - Bjerre, Karsten Dalsgaard
AU - Hviid, Anders
AU - Krebs, Lone
AU - Jensen, Jørgen S
AU - Christiansen, Michael
PY - 2022
Y1 - 2022
N2 - The aim of this study was to determine whether COVID-19 restrictions had an impact on Chlamydia trachomatis infections compared with 2018 and 2019. A retrospective nationwide observational study was performed using monthly incidences of laboratory-confirmed chlamydia cases and number of tests, obtained from Danish national surveillance data. Testing rates and positivity rates were compared using Poisson and logistic regression. The first Danish COVID-19 lockdown (12 March to 14 April 2020) resulted in a reduction in the number of chlamydia tests performed (rate ratio 0.72, 95% confidence interval (95% CI) 0.71-0.73) and a consequent reduction in the number of laboratory-identified cases (66.5 vs 88.3 per 100,000 during the same period in 2018 to 2019). This period was followed by a return of testing and test positivity close to the level seen in 2018 to 2019. The second Danish COVID-19 lockdown (17 December to 31 March 2021) resulted in crude incidence rates of laboratory-confirmed chlamydia infection that were similar to the crude incidence rates seen during same period in 2018 to 2019. In conclusion, the Danish COVID-19 restrictions have had negligible effects on laboratory-confirmed C. trachomatis transmission.
AB - The aim of this study was to determine whether COVID-19 restrictions had an impact on Chlamydia trachomatis infections compared with 2018 and 2019. A retrospective nationwide observational study was performed using monthly incidences of laboratory-confirmed chlamydia cases and number of tests, obtained from Danish national surveillance data. Testing rates and positivity rates were compared using Poisson and logistic regression. The first Danish COVID-19 lockdown (12 March to 14 April 2020) resulted in a reduction in the number of chlamydia tests performed (rate ratio 0.72, 95% confidence interval (95% CI) 0.71-0.73) and a consequent reduction in the number of laboratory-identified cases (66.5 vs 88.3 per 100,000 during the same period in 2018 to 2019). This period was followed by a return of testing and test positivity close to the level seen in 2018 to 2019. The second Danish COVID-19 lockdown (17 December to 31 March 2021) resulted in crude incidence rates of laboratory-confirmed chlamydia infection that were similar to the crude incidence rates seen during same period in 2018 to 2019. In conclusion, the Danish COVID-19 restrictions have had negligible effects on laboratory-confirmed C. trachomatis transmission.
U2 - 10.2340/actadv.v102.2324
DO - 10.2340/actadv.v102.2324
M3 - Journal article
C2 - 35393629
VL - 102
JO - Acta Dermato-Venereologica
JF - Acta Dermato-Venereologica
SN - 0001-5555
M1 - adv00704
ER -
ID: 303611354