The Centers for Disease Control and Prevention and the Food and Drug Administration said on Monday they have not detected any indication so far that Pfizer-BioNTech’s COVID-19 vaccine causes inflammation of the heart, but are monitoring with “special interest” reports of cases.

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Over the weekend, Israel’s pandemic response coordinator said it was a “question mark” whether Pfizer’s vaccine had caused tens of cases of myocarditis, a dangerous condition of heart inflammation, that had been identified there primarily among young men after they had taken their second dose, according to Reuters.

Pfizer, in a statement to McClatchy, said that it was aware of the Israeli observations and that the company has “not observed a higher rate of myocarditis than what would be expected in the general population. A causal link to the vaccine has not been established.”

Read more at McClatchy.