Total number of U.S. COVID-19 cases as of March 10, 2023, by state

As of March 10, 2023, the state with the highest number of COVID-19 cases was California. Almost 104 million cases have been reported across the United States, with the states of California, Texas, and Florida reporting the highest numbers.From an epidemic to a pandemicThe World Health Organization declared the COVID-19 outbreak a pandemic on March 11, 2020. The term pandemic refers to multiple outbreaks of an infectious illness threatening multiple parts of the world at the same time. When the transmission is this widespread, it can no longer be traced back to the country where it originated. The number of COVID-19 cases worldwide has now reached over 669 million.The symptoms and those who are most at riskMost people who contract the virus will suffer only mild symptoms, such as a cough, a cold, or a high temperature. However, in more severe cases, the infection can cause breathing difficulties and even pneumonia. Those at higher risk include older persons and people with pre-existing medical conditions, including diabetes, heart disease, and lung disease. People aged 85 years and older have accounted for around 27 percent of all COVID-19 deaths in the United States, although this age group makes up just two percent of the U.S. population

截至2023年3月10日，加利福尼亚州报告的COVID-19病例数位居各州之首。全美累计报告病例近1.04亿，其中加利福尼亚州、德克萨斯州和佛罗里达州报告的病例数最多。自流行病演变为大流行病2020年3月11日，世界卫生组织宣布COVID-19疫情为大流行病。‘大流行病’一词指的是一种传染性疾病在世界的多个地区同时爆发，当传播范围如此广泛时，已无法追溯至其起源国。全球COVID-19病例数现已超过6.69亿。症状及高风险人群感染该病毒的大多数人仅会出现轻微症状，如咳嗽、感冒或高烧。然而，在更严重的病例中，感染可能导致呼吸困难，甚至肺炎。高风险人群包括老年人以及患有慢性疾病的人群，如糖尿病、心脏病和肺病。在美国，85岁及以上的老年人约占所有COVID-19死亡病例的27%，尽管这一年龄组仅占美国总人口的2%。