Vaccines against covid-19 have been one of the greatest achievements to combat the pandemic, but they have also raised concerns in part of the population.
How effective are they? How long does the immunity they offer last? Do they work against the new variants? Will it be necessary to reinforce some with a third dose? Can doses of two different vaccines be combined?
You can use this form to send us your questions.
At BBC Mundo we will select some of them to consult a vaccine expert and publish their responses.
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