University of Oxford announces plan to recruit 300 volunteers aged 6-17, with up to 240 receiving the COVID-19 vaccine and the remainder a control meningitis shot

How long immunity lasts from natural infection is one of the big questions of the pandemic. Recent global developments have scientists worried that the calculation is changing

Preliminary study shows shot may not prevent transmission of South African strain, or stop mild and moderate cases -- though it might curb serious cases and deaths

Drugmaker says it's unable to clarify vaccine's impact against severe disease as most subjects in trial were young and healthy; no participants were hospitalized or died

Tehran has also ordered millions of AstraZeneca shots despite Khamenei banning vaccines made by Britain

Non-peer-reviewed research by vaccine creator Oxford University is hailed by UK politicians as confirming strategy of waiting 12 weeks between doses

Comments come as bloc backs off on threat to restrict exports to Northern Ireland in tussle with Britain; experts visit 1st Chinese hospital to treat patients diagnosed with virus

Thousands of non-inoculated workers crossing over from West Bank pose risk for Israelis, experts say, while clarifying that citizens take priority

Ramallah appears to claim Israel liable for ensuring Palestinians in West Bank and Gaza are vaccinated, but then backtracks to acknowledge PA responsible

Iran's supreme leader had said importing shots from US or UK was prohibited: 'It's not unlikely they would want to contaminate other nations'