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📢 文末扫码进裙，免费领取双语精读版 Why Covid Is Back This Summer？ Newsweek Health 18 July, 2024 | 682 words | ★★ ★ ☆ ☆ U.S. cases of COVID-19 are on the rise following a springtime lull in infections. But what is the reason behind this spike, and should you be concerned? Across the U.S., there has been a significant uptick in wastewater levels of SARS-CoV-2, particularly in the West, according to surveillance by the U.S. Centers for Disease Control and Prevention (CDC). This has been matched by a similar increase in COVID test positivity, with an 11 percent increase in the first week of July alone. As of July 6, nearly two-thirds of cases were attributable to the new FLiRT subvariants, which rose to dominance in the first few months of 2024. These new variants, known as KP.2 and KP.3, are more infectious than previous strains because of the small number of mutations in their spike proteins, which allow them to evade our immune systems. However, unlike
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