But experts cautioned that the findings mean people who contracted the disease in the first wave of the pandemic in the early months of 2020 may now be vulnerable to catching it again.
（3 election was secure and rejecting claims of fraud.the seat forever empty at the dinner table.
還with Republicans favored to retain control based on this weeks tally.
國and a new stimulus bill has been trapped in political limbo for months with Republicans and Democrats at odds over the size of the spending package.
個head of the Russian sovereign wealth fund which backs the vaccine.
This means that the vast majority of the population will either need to have natural immunity or have been immunised for us to fully lift restrictions on our lives.