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Summer Walker was heavily criticized for alleging that Covid-19 mRNA vaccines are contagious and can cause spontaneous abortions.

The R&B singer sparked controversy when she warned her followers that standing next to a vaccinated person can cause miscarriages and blood clots.

The 25-year-old singer made the unusual remarks in posts on social media on Monday.

"We're all f*****d," she wrote in her Instagram stories. "Stay the f*** away from people who were vaccinated. People are reporting bleeding, bruising, spontaneous periods and miscarriages from being in close [proximity] to a recently vaccinated person." She added the hashtag #YouHaveBeenWarned.

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In a follow-up post Summer wrote in all caps:

"I'm alarmed by the amount of women in my DM's complaining about abnormal bleeding and miscarriages after coming in contact with someone whose been vaccinated!!!!!"

Instagram attached a Covid fact-checking information box to Summer's post noting that Covid-19 vaccines are tested for "safety and effectiveness".

Millions of people have reported adverse reactions to Covid-19 mRNA vaccines around the world. But there are no reports of contracting adverse effects from simply standing next to a vaccinated person.