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Evolution of Lyme Borreliosis Epidemiology in Primary Care and Hospital Settings in France During the COVID-19 Pandemic.

Background: Lyme borreliosis (LB) remains a public health concern in France despite improved patient management and medical care. Stay-at-home restrictions during the COVID-19 pandemic, which affected participation in outdoor recreational activities and disrupted access to health care services, may have impacted the risk of developing LB. Methods: We analyzed data from two general practitioner networks in France (Sentinel Network and an electronic medical records database [EMR]) and the national hospital discharge database to describe LB epidemiology in 2020-2021 and compare it to previous years. Google Trends' search volume was used to evaluate the association between the population's interest in LB and the evolving epidemiology. Results: Annual LB incidence rates in primary care decreased from 104 cases/100,000 population in 2018 to 71/100,000 in 2021 and from 82/100,000 to 60/100,000 according to Sentinel Network and EMR, respectively. Google Trends' search volume for "Lyme" followed a similar trend, one year earlier. Annual hospitalizations were stable from 2012-2019 (1.6/100,000 on average) and declined to 1.3/100,000 in 2020 and 1.1/100,000 in 2021. This decline was observed primarily in adults ( e.g., 3.4/100,000 in 2017-2019 to 1.8/100,000 in 2020-2021 for 70-79 years of age). Changes in regional incidence rates in primary care from 2017-2019 to 2020-2021 ranged from -75% to 208%. Hospitalizations decreased in all regions except in Bretagne. Conclusions: The estimated LB incidence decreased in 2020 and 2021 compared with previous years but this change may not be related to COVID-19. The incidence decrease observed in primary care could result from reduced population interest in LB, leading to lower care-seeking behavior. The decrease in LB hospitalizations may be explained by changes in clinical practice. Surveillance systems are critical to understand the evolution of LB epidemiology. However, external factors impacting incidence estimates should be considered.

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