In Israel's Covid-19 wards, doctors are learning which vaccinated patients are most vulnerable to severe illness, amid growing concerns about instances in which the shots provide less protection against the worst forms of the disease.
US officials said their booster plan is based on concern that over time, the vaccines will provide less protection against severe disease, including among younger adults.
In Israel, daily new cases have increased from the single digits in June to around 8,000 since the arrival of Delta. About half of the cases — the majority of them mild to moderate — are in vaccinated people. Among 3 million vaccinated Israelis covered by Clalit, the country's largest healthcare provider, 600 have suffered severe breakthrough cases since June. Around 75% of them were above the age of 70 and were at least 5 months after their second dose, according to Ran Balicer, Clalit's chief innovation officer. Nearly all of them have chronic illnesses.In the UK, doctors described similar characteristics among vaccinated patients who fall severely ill.
In Texas, 92% of the vaccine breakthrough cases that resulted in death were in people over the age of 60 and 75% had a known underlying condition that put them at high risk from Covid-19, according to a public health department spokesperson.
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