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China reports 522,000 new COVID-19 cases, one death in July amid fluctuating upward trend_我的网站

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    Photo： VCG
China reported 522,000 newly confirmed COVID-19 cases in July, including 487 severe cases and one related death with cases showing a fluctuating upward trend, China's national disease control authority said. 
The current uptick in infections represents another regular cyclical wave, with its severity comparable to surges seen in the past two years. The upward growth curve has slowed markedly, and the country is now on the plateau phase of this epidemic peak, said the Chinese Center for Disease Control and Prevention (Chinese CDC) on Thursday. 
All tested infection samples were confirmed to be the Omicron variant, with the NB.1.8.1 strain and its sublineages accounting for the majority of circulating cases, the Chinese CDC said. 
A Beijing-based respiratory disease specialist told the Global Times that waning population immunity, continued virus mutations that weaken existing antibody protection, and increased summer travel have contributed to the recent modest rise in infections. However, there is no evidence that the virus has become more pathogenic. Nationwide infections appear to be nearing their peak and case numbers may begin falling in late August. 
    A screenshot from Chinese CDC report on new COVID-19 cases in July nationwide
According to sentinel hospital surveillance data, from June 29-July 5 to July 27-August 2, the proportion of influenza-like illness among all outpatient and emergency visits at China's 1,041 COVID-19 and influenza sentinel hospitals edged up with slight fluctuations, standing at 4.3 percent, 4.4 percent, 4.5 percent, 4.4 percent and 4.5 percent, respectively.
During the same period, the COVID-19 positivity rate among patients with influenza-like illness in outpatient and emergency departments rose for consecutive weeks.
Several factors drove the fluctuating rise in COVID-19 cases in July. Population immunity has waned, as more than six months have passed since the last major wave of infections for most people, while continued SARS-CoV-2 mutations have reduced the protection provided by existing antibodies, Li Tongzeng, a respiratory disease medic from Beijing You An Hospital to the Capital Medical University, told the Global Times on Friday. 
These factors, combined with increased travel and population mobility during the summer vacation, contributed to the recent small-scale surge. Based on patterns observed in recent years, COVID-19 infections tend to rise every six to eight months as population immunity declines, said Li.
The expert noted that while the virus continues to mutate, there is no evidence that it has become more pathogenic. Clinical data show that most patients develop only mild symptoms, with very few progressing to pneumonia or requiring hospitalization.
The Chinese CDC noted on Thursday that since COVID-19 was reclassified as a Category B infectious disease under Category B management, it has evolved into a prevalent, recurring respiratory infectious disease in China, with one to two epidemic fluctuations occurring nationwide each year.
Li also noted that residual immunity from previous infections also helps reduce disease severity, with most reinfections presenting as mild upper respiratory symptoms that resolve within about a week. The single COVID-related death reported nationwide in July further indicates that the current fatality rate remains very low.
Judging from historical epidemic patterns and current case growth trajectories, national infection figures may begin to decline in late August. Nationwide case numbers are now nearly at their peak, with declines already observed in some regions, said Li. 
The Chinese CDC also said on Thursday that surveillance had not detected any variants posing major public health risks, nor had the current wave caused notable disruptions to the healthcare system.
The public is advised to take appropriate protective measures, including wearing masks when necessary, maintaining good personal hygiene, adopting healthy lifestyles and getting vaccinated as recommended.
。    受台风“白海豚”带来的持续强降雨影响，富阳区岩石岭水库水位快速上涨，8月9日夜间，在保障大坝工程安全的前提下开启有序泄洪，全力减轻下游河道防洪压力。

B | 昨天上午，岩石岭水库溢流坝旁，奔涌的水流顺着弧形坝面倾泻而下，在坝底撞击出数米高的白色水浪，水声持续回响，细密的水雾裹挟着雨意漫向岸边。

C | 泄洪通道水流顺畅、行洪有序，各类监测设备实时运转，精准追踪水位与流量的动态变化。岩石岭水库削峰率超过四成据富阳区岩石岭水库管理中心工作人员钟群锋介绍，水库从前天23时02分开始泄洪，最大洪峰出现在昨天5时20分左右，达到水库最高水位53.36米，超过溢流坝1.22米。“岩石岭水库的闸门是藏在溢流坝下面的，所以，闸门如果拉起来，其实是挡水的。目前，闸门全部关闭，水全部从溢流坝上直接溢流。现在出库流量是139立方米/秒。泄洪三四天，水位能降到汛限水位以下。”钟群锋说。通过水库的调蓄削峰，削峰率超四成，有效缓冲了洪水对下游的瞬时冲击。

D | 针对公众关心的泄洪下游影响，水利部门明确表示，本次泄洪严格遵循汛期调度方案，下泄流量始终控制在下游河道设计安全行洪能力以内，正常情况下不会造成下游村镇、农田洪涝灾害。水库通过拦蓄调洪拉长了洪水下泄过程，避免天然洪峰直接冲击下游河道，大幅降低了沿线的行洪压力与灾害风险，当前下游河道水位整体平稳。下一步，富阳区将持续紧盯台风动向与水情变化，加密全区山塘水库巡查监测频次，遇险情第一时间启动应急处置，全力保障人民群众生命财产安全。余杭北湖分洪闸6个闸门全部开启受台风“白海豚”影响，8月10日1时40分，杭州苕溪流域瓶窑站水位涨至5.66米。8月10日8时30分，余杭区启用北湖滞洪区，北湖分洪闸6个闸门全部开启，通过分洪削峰，缓解东苕溪流域严峻防洪压力，保障区域防洪安全。余杭区地形复杂，东苕溪河道源短流急，极易引起水位暴涨暴落。西险大塘位于东苕溪右岸，是杭州西北部重要防洪屏障，也是守护杭嘉湖平原的最后一道防线。北湖滞洪区位于瓶窑镇张堰村，地处三苕溪汇流三角地带，总面积5.3平方公里，滞洪库容2050万立方米，是一个生态湿地，俗称“北湖草荡”。

E | 目前，西险大塘已先后实施加固工程，二次改造后的北湖分洪闸分洪能力由每秒315立方米提升至525立方米，为本次应急分洪提供了有力保障。北湖滞洪区定位是东苕溪的蓄洪专属空间，全部蓄满可容纳2000万立方米的水。相关部门表示，启用北湖滞洪区不会危及群众生命财产安全。北湖滞洪区就是一个天然生态湿地，没有人员居住，泄洪前相关部门也进行仔细排查，确保里面没有人员。

F | 8月10日8时，东苕溪水利工程运管中心拉响了分洪预警，提醒群众不要进入滞洪区，8时30分启动闸门进行分洪。北湖滞洪区启用之后，还会继续加强东苕溪、中苕溪、北苕溪的堤防巡堤查险工作，及时发现各类风险隐患。同时，余杭区林业水利局一支专家队伍下沉到了3个片区，及时进行研判处置，做到险情“抢早、抢小”。

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Published on:13:46:15