In this issue:
Impact of SARS-CoV-2 infection during pregnancy
Post-COVID conditions in US adults
Omicron variant increases the risk of SARS-CoV-2 reinfection
Safety and efficacy of a third dose of BNT162b2
Effect of mRNA vaccine boosters against Omicron variant
Efficacy of convalescent plasma in outpatients with COVID-19
Association between air pollution and COVID-19 severity
Risk factors associated with SARS-CoV-2 infection in UK healthcare workers
High- vs standard-dose vitamin D3 in older adults with COVID-19
Trajectory of long COVID symptoms after COVID-19 vaccination
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