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Healthcare workers incubate a patient at a Covid-19 Intensive Care Unit (ICU) of Salinas Valley Memorial Hospital in Salinas, California, U.S., on Jan. 26, 2021. Photo: Nic Coury/Bloomberg via Getty Images

About 23% of COVID-19 patients have developed at least one "persistent or new" medical condition more than four weeks after their initial diagnosis, according to a new study from FAIR Health.

Why it matters: New post-COVID symptoms were discovered across different age groups. The five most common were pain, difficulty breathing, high cholesterol, malaise and fatigue, and high blood pressure, reports the New York Times.

The big picture: The study looked at insurance data from nearly 2 million COVID-19 patients from February 2020 to February 2021, making it the largest study to date of long-term symptoms, the Times notes.

  • Other issues patients experienced included migraines, sleep disorders, heart abnormalities, skin issues, kidney failure, blood clots, brain fog, and anxiety and depression.

While experiencing new symptoms was more common among patients who had had severe cases of the virus, many had had only mild symptoms of COVID-19 while others were asymptomatic.

  • "Of patients who were hospitalized with COVID-19, the percentage that had a post-COVID condition was 50 percent; of patients who were symptomatic but not hospitalized, 27.5 percent; and of patients who were asymptomatic, 19 percent," said the study.

What they're saying: “One thing that was surprising to us was the large percentage of asymptomatic patients that are in that category of long Covid,” Robin Gelburd, president of FAIR Health, told the Times.

  • Some people exhibiting these post-COVID symptoms "may not have even known they had Covid," emphasized Gelburd, to the Times.

Go deeper

Aug 3, 2021 - Health

Israel reinstates COVID-19 restrictions as cases surge

Elderly residents wait to receive their third dose of the Pfizer-BioNTech Covid-19 vaccine at a medical center in Tel Aviv on Aug. 2. Photo: Kobi Wolf/Bloomberg via Getty Images

Israel announced Tuesday it will tighten public health measures due to surging in COVID-19 case numbers.

Driving the news: The latest restrictions come as Israel saw nearly 4,000 new daily cases reported on Tuesday, the highest count so far since the country began experiencing an uptick last month, the AP reports.

23 hours ago - Health

Biden to GOP governors who resist COVID rules: "Get out of the way"

President Biden speaks at the White House on Tuesday. Photo: Shawn Thew/EPA/Bloomberg via Getty Images

President Biden spoke out Tuesday against Republican governors who've sought to block vaccine and mask mandates, as COVID-19 cases spike across the U.S.

Why it matters: Biden has tried to avoid making the pandemic a partisan issue, but the Washington Post notes the White House "has grown increasingly frustrated" with Republican leaders looking to obstruct health measures.

Greece's artistic swimming team to miss Olympics after COVID outbreak

Greece's Maria Alzigkouzi Kominea and Evangelia Papazogloun the Artistic Swimming Duet Free Routine Preliminary of the Olympic Games at Tokyo Aquatics Centre on Aug. 2, 2021 in Japan. Photo" Clive Rose/Getty Images

Greece's entire 12-woman artistic swimming team is out of the Tokyo Olympic Games due to an outbreak of COVID-19 among the group.

Driving the news: Tokyo Games organizers confirmed Wednesday that five members of the Greek team had tested positive for the virus and that their teammates were considered close contacts.