Despite recent efforts to address the issue, medical-related websites continue to be mined for data including personal medical information, in an apparent violation of patients’ privacy rights, according to a new study.

Some of the most common tracking pixels were from Alphabet Inc.’s Google, Microsoft Corp., Meta Platforms Inc. and ByteDance, the parent company of TikTok, according to a report by the cybersecurity company Feroot Security.

Feroot analyzed hundreds of health-care and telehealth websites and found that more than 86% are co

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