Shuko Takahashi

SARS-CoV-2 infection is associated with increased risk of depressive symptoms. We sought to examine associated factors of depressive symptoms approximately one year after SARS-CoV-2 infection. A survey of 528 individuals aged 16 years or older who were diagnosed with COVID-19 between 29 July 2020, and 31 March 2021 was conducted in Iwate Prefecture, Japan. The survey was administered from 15 November to 15 December 2021 (response rate, 40.9%). After excluding participants with incomplete responses, 151 respondents were included in the analytical sample. Depressive symptoms during the last week was assessed by the Japanese version of the CES-D scale. We examined factors associated with depressive symptoms using logistic regression analyses. The mean follow-up was 11 months (SD 1.6; range 7–16). The prevalence of depressive symptoms was 15.9%. Individuals living alone had significantly elevated risk of depressive symptoms (odds ratio, 3.38, 95% confidence interval: 1.13–10.10). Depressive symptoms one year after SARS-CoV-2 infection was associated with social circumstances (living alone), but no other biomedical factors, such as the severity of the original disease (e.g., requiring oxygen supplementation in hospital).

Background:Few studies have specifically examined the relationship between social media use and uptake of COVID-19 booster. This study examined the association between social media use and COVID-19 booster vaccination uptake in Japan during the pandemic.Methods:A series of cross-sectional surveys was conducted using rapid online questionnaires among residents of Iwate Prefecture, Japan, from October 1 to 3, 2021, and from December 11 to 17, 2023 (n = 4,026). Vaccination status was assessed using a single question: “What is your vaccination status?”. Respondents were categorized into two groups: individuals with incomplete booster uptake (those who had received one or two doses; n = 226) and booster acceptors (those who had received at least three doses; n = 3,800). Social media use was defined as self-reported use of Twitter, Facebook, Instagram, YouTube, or other social networking services. Logistic regression analyses were conducted to examine the association between social media use and receipt of a COVID-19 booster vaccination.Results:Social media use was significantly associated with higher odds of incomplete booster uptake of COVID-19 vaccination. This association remained statistically significant after adjustment for relevant covariates (odds ratio [OR] 1.70, 95% confidence interval [CI] 1.21–2.39). Individuals with a history of COVID-19 infection prior to the initiation of booster vaccinations were less likely to receive a booster dose in an exploratory analysis (OR 3.06, 95% CI 1.28–7.32).Conclusion:Differential associations between media use and COVID-19 booster uptake may provide important insights for designing effective communication strategies to improve vaccine acceptance in future pandemics.

We examined the associations between the use of different types of media and COVID-19 vaccine hesitancy, as well as risk behaviors of COVID-19 infection, in Japan in late 2021. Cross-sectional surveys were conducted using rapid online surveys of residents in Iwate Prefecture from February 5 to 7, 2021, and from October 1 to 3, 2021. Each individual's risk of acquiring SARS-CoV-2 infection was calculated using a quantitative assessment tool (the microCOVID). Intention to get vaccinated for COVID-19 was assessed by self-report. Usage of five types of media for obtaining COVID-related information was assessed: (1) newspapers, (2) television or radio, (3) internet or news apps, (4) social network services (SNS) (excluding LINE, a popular messaging app), and (5) other. Reliance on SNS did not show significant associations with either intention to get vaccinated or engaging in risky behavior for acquiring COVID-19. Although users of the internet or news apps were marginally significantly less likely to engage in high-risk behavior, significant associations between vaccine hesitancy and the usage of the internet or news apps were found in the middle age and elderly groups (OR [95% confidence interval (CI)] in middle age: 1.55 [1.07-2.23]; in elderly; 9.24 [3.28-26.02]). The differential associations between different types of media use and COVID-19 prevention behaviors may assist in preparing for future pandemic outbreaks. One implication for public health risk communication is audience segmentation, such as emphasizing vaccine safety and effectiveness for older audiences.

Tanuma J, et al. J Glob Health Sci. 2024 Dec;6(2):e19. https://doi.org/10.35500/jghs.2024.6.e19

This study aimed to review evidence on future long-term care associated with pre-existing factors among community-dwelling Japanese older adults. We systematically searched cohort and nested case–control studies published between 2000 and 2019 that assessed long-term care certification using the PubMed, CINAHL, and EMBASE databases. The relationship between long-term care insurance information and risk factors was investigated. The protocol was registered with the Open Science Framework. We extracted 91 studies for synthesis, including 84 prospective cohort studies, 1 retrospective cohort study, and 6 nested case–control studies. Certification for long-term care was classified into two endpoints: onset of functional disability and dementia. There were 72 studies that used long-term care certification as a proxy for functional disability, and 22 used long-term care information to indicate the onset of dementia. Common risk factors related to functional disability were physical function, frailty, and oral condition. Motor function and nutritional status were common risk factors for dementia. We found consistent associations between premorbid risk factors and functional disability and dementia. The accumulation of evidence on the incidence of long-term care and associated factors can aid the development of preventive measures. Future studies should aim to integrate this evidence.

Objectives There has been no study in Japan on the predictors of risk for acquiring SARS-CoV-2 infection based on people’s behaviour during the COVID-19 pandemic. The aim of this study was to document changes in risk behaviour during the New Year’s holiday season in 2021 and to identify factors associated with high-risk behaviour for infection using a quantitative assessment tool. Design A longitudinal survey. Setting Multiphasic health check-ups for the general population in Iwate Prefecture. Participants Serial cross-sectional data were obtained using rapid online surveys of residents in Iwate Prefecture from 4 to 7 December 2020 (baseline survey) and from 5 to 7 February 2021 (follow-up survey). The data in those two surveys were available for a total of 9741 participants. Main outcome measures We estimated each individual’s risk of acquiring SARS-CoV-2 infection based on the microCOVID calculator. We defined four trajectories of individual risk behaviours based on the probabilities of remaining at low risk, increasing to high risk, improving to low risk and persistence of high risk. Results Among people in the low-risk group in the first survey, 3.6% increased to high risk, while high risk persisted in 80.0% of people who were in the high-risk group at baseline. While healthcare workers were significantly more likely to be represented in both the increasing risk and persistently high-risk group, workers in the education setting were also associated with persistence of high risk (OR 2.58, 95% CI 1.52 to 4.39; pConclusions In determining countermeasures against COVID-19 (as well as future outbreaks), health officials should take into account population changes in behaviour during large-scale public events.

The first case of coronavirus disease 2019 (COVID-19) in Japan was confirmed on 16 January 2020. The first wave of cases peaked on 10 April 2020 (n = 710) and the second on 7 August 2020 (n = 1595). Iwate Prefecture in north-eastern Japan was the last prefecture to confirm a case of COVID-19, on 29 July 2020, 110 days after all other prefectures had confirmed cases. No cases were reported during the first wave.1 As of 21 September 2021, there had been 3469 cases (282.8/100 000 population) and 52 deaths (1.50% fatality rate) in Iwate and 1.7 million cases (1333.2/100 000 population) and 17 294 deaths (1.03% fatality rate) in Japan overall. This article discusses possible reasons for the low number of COVID-19 cases in Iwate.