新冠再来袭 专家提醒：当前正处于小波峰

Core Insights - The recent increase in COVID-19 positivity rates indicates a small peak, with notable cases leading to event cancellations, such as singer Eason Chan's concert postponement [1][2] Summary by Sections Current COVID-19 Situation - The positivity rate for COVID-19 has risen from 7.5% to 16.2% in outpatient flu-like cases and from 3.3% to 6.3% in hospitalized severe acute respiratory infection cases during the monitoring period from March 31 to May 4 [2] - Experts warn that the current wave is a small peak, with predictions that the positivity rate will decline to 8%-10% by early June and below 5% by mid to late June [5] Vulnerable Populations - Elderly individuals remain a high-risk group, with the highest positivity rates observed in those aged 60 and above during the recent monitoring period [3] - Immunocompromised individuals and those with chronic conditions are particularly at risk for severe outcomes [3][4] Virus Characteristics - The current circulating strain is primarily the NB.1 series, which shows no significant change in pathogenicity compared to previous strains, although it has a higher transmission advantage [6] - The NB.1 strain exhibits greater immune evasion capabilities but is not expected to cause more severe disease than previous variants [6] Regional Variations - Southern provinces have reported slightly higher COVID-19 positivity rates compared to northern provinces, attributed to climatic differences that favor virus transmission [7]