Varicella (chickenpox) is an infectious disease caused by the highly contagious varicella zoster virus with a secondary attack rate greater than 90%. From this perspective, we aimed to establish the basis for a national varicella vaccine policy by reviewing vaccination programs and policies of countries that have introduced universal varicella vaccinations. As a result of the spread of varicella, an increasing number of countries are providing two-dose vaccinations and universally expanding their use. In practice, the efficacy and effectiveness of vaccination differ among vaccines and vaccination programs. Optimized vaccination strategies based on each country's local epidemiology and health resources are required. Accordingly, it is necessary to evaluate the effectiveness of varicella vaccines in different settings. Given the short-term and fragmented vaccine effectiveness evaluation in Korea, it is necessary to evaluate its effectiveness at the national level and determine its schedule based on the evidence generated through these studies.

What is the spatial distribution and determinants of coronavirus disease 2019 (COVID-19) infection among students in Korea? Finding: The community population was closely associated with the risk of COVID-19, and the number of students per school class were inversely associated with COVID-19 rates in students.

The objective of this study is to establish foundational data for comprehending the dynamics of research on andropause among middle-aged men. Additionally, it aims to identify potential applications for the development of counseling and education programs tailored specifically to this demographic, as well as to outline future directions and implications for further studies on middle-aged men. This study employs a descriptive research approach, analyzing the literature published in Korea over the past decade that pertains to andropause among middle-aged men. Over the course of the decade spanning from 2012 to 2022, a total of 22 papers addressing andropause-related studies among middle-aged men were identified in Korea. By examining the outcomes of these studies, the following four categories were delineated: understanding the nature of andropause in middle-aged men, comparing andropause experiences among middle-aged men, exploring correlations between andropause and other variables, and investigating causality between andropause and other variables. The findings of this study hold promise in raising awareness among the general population regarding the potential occurrence of andropause in men. Currently, societal policies and perceptions predominantly focus on menopausal care for women. By highlighting the physical, social, and mental changes experienced by men, this research can contribute to enhancing overall awareness and understanding of andropause, thus maximizing its impact.