Over half of the world’s population has received at least one dose of a Covid vaccine. Supply is still a big problem, especially in poorer countries where less than 10% of people are vaccinated. But even when vaccines are available, some remain hesitant to take them. BBC Reality Check's health reporter Rachel Schraer answers some of your concerns – from pregnancy side effects to the speed at which vaccines were developed. Please subscribe HERE http://bit.ly/1rbfUog #BBCNews

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