With delays in global production and distribution, mixing two doses of vaccines may end up becoming inevitable. But questions concerning its safety and efficacy remain unanswered.
Vaccination drive temporarily suspended in Nangarhar province after three women healthcare workers were killed in two separate attacks in the restive eastern city of Jalalabad.
Wealthy nations have snapped up several billion doses of Covid-19 vaccines, while some countries in the developing world have little or none.
The Kingdom's National Committee for Infectious Diseases uses a scientific process to approve vaccines based on safety and efficacy results of clinical studies and other data provided by manufacturers.
British Prime Minister Boris Johnson warns that tougher lockdown restrictions are likely as the country's infection rates reach highest recorded levels.
Poorer nations may be left behind as wealthy nations, accounting for just 14 percent of the global population, have pre-ordered just over half of the vaccine doses expected to be produced.
President Jair Bolsonaro has persistently defied expert advice on containing the pandemic and recently declared he did not plan to be vaccinated.
US experts differ from other countries in prioritising which group of people to vaccinate first.
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