Coronavirus disease (COVID-19) - World Health Organization (WHO) Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring special treatment
COVID-19 - Global Situation - World Health Organization (WHO) Since mid-February 2025, according to data available from sentinel sites, global SARS-CoV-2 activity has been increasing, with the test positivity rate reaching 11%, levels that have not been observed since July 2024 This rise is primarily observed in countries in the Eastern Mediterranean, South-East Asia, and Western Pacific regions Since early 2025, global SARS-CoV-2 variant trends have
Coronavirus disease (COVID-19) - World Health Organization (WHO) COVID-19 is the disease caused by the SARS-CoV-2 coronavirus It usually spreads between people in close contact COVID-19 vaccines provide strong protection against severe illness and death Although a person can still get COVID-19 after vaccination, they are more likely to have mild or no symptoms
Coronavirus Disease (COVID-19) Situation Reports The Weekly Epidemiological Update provides an overview of the global, regional and country-level COVID-19 cases and deaths, highlighting key data and trends; as well as other pertinent epidemiological information concerning the COVID-19 pandemic
Coronavirus disease (COVID-19) - World Health Organization (WHO) Joint bimonthly surveillance report on SARS-CoV-2 and mpox in animals in the European Region, November Strengthened surveillance using a One-Health approach in at-risk animal populations and at the animal-human-environment interface is required to timely
如何通俗易懂地解释「协方差」与「相关系数」的概念？ - 知乎 \rho_{YZ}=\frac{Cov(Z,Y)(岁\cdot公斤)}{\sigma_Z(岁)\sigma_Y(公斤)}=\frac{Cov(Z,Y)}{\sigma_Z\sigma_Y}\\ 单位就约掉了，变成没有单位的数了，就可以进行比较了。 比如刚才提到的身高 X ，体重 Y 以及年龄 Z ，假如说根据数据算出来：
WHO Coronavirus Network (CoViNet) The WHO Coronavirus Network (CoViNet) aims to bring together surveillance programs and reference laboratories to support enhanced epidemiological monitoring and laboratory (phenotypic and genotypic) assessment of SARS-CoV-2, MERS-CoV and novel coronaviruses of public health importance
Risk evaluation for SARS-CoV-2 Variant Under Monitoring: LP. 8. 1 LP 8 1 is currently one of two SARS-CoV-2 variants under monitoring (VUM) with increasing prevalence globally, the other being XEC Considering the available evidence, the additional public health risk posed by LP 8 1 is evaluated as low at the global level
Coronavirus disease (COVID-19): How is it transmitted? Further research is ongoing to better understand the spread of the virus and which settings are most risky and why Research is also under way to study virus variants that are emerging and why some are more transmissible For updated information on SARS-CoV-2 variants, please read the weekly epidemiologic updates
COVID-19 epidemiological update – 14 March 2025 Overview During the four-week reporting period from 6 January to 2 February 2025, weekly SARS-CoV-2 PCR percent test positivity changed from 7 3% in the beginning week of the reporting period to 5 0% in the last week, as detected in integrated sentinel and systematic virological surveillance within the Global Influenza Surveillance and Response System (GISRS)