Epidemiology of COVID-19: What changed in one year?

Abstract

Basic reproduction number (Ro) as an indicator of the transmissibility of a virus is utilized frequently. Ro of COVID-19 was quite different among countries. It is well-known that its value was 3.2 in China whilst it was 2.2 in western European countries [7]. In a mathematic modeling, Ro values in Turkey and Japan were 1. 71 and 4.3, respectively [8]. In a metaanalysis, the pooled global Ro was found to be 4.08 [9]. Stated simply, the estimated summary reproductive number was 2.87 (95% CI, 2.39-3.44) [10]. As for time-varying reproduction number (Rt), it is the value for the population which was not completely susceptible and not fully adopted some prevention or control measures. In a study, upon evaluating Rt values for 160 countries, it can be expressed that this value was nearly 10 at the beginning of pandemic [11].

Immediate and 6-month seizure outcomes following first and second SARS-CoV2 mRNA vaccinations: A multicenter study with a nationwide survey

“…The epidemiological difference that the spread of COVID-19 infection is smaller in Japan than in other countries should be acknowledged when applying the data of this study to other countries [34] . Conversely, the vaccination coverage rate in Japan was 77% on December 3, 2021, and a similar vaccination rate was obtained in our dataset.…”

COVID-19 in pediatric nephrology centers in Turkey

“…Coronavirus disease 2019 (COVID-19) is a novel viral disease caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) virus, which has been declared a pandemic due to its global spread [ 1 , 2 ]. One year after the first confirmed case of COVID-19 in Turkey on March 11 th , 2020, the total number of infected individuals reached approximately 3 million at the end of the first year [ 3 ]. The epidemiological characteristics of children infected with SARS-CoV-2 are limited; however, its incidence is much lower than in adults.…”