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Chelsea transfer round-up: key decisions on defensive duo linked by Kelechi Iheanacho

Boston HIV outbreak linked to COVID-19 pandemic

Coronavirus outbreak in nursing home in Kentucky, linked to variant R.1, raises concerns about the impact of the vaccine

Too little sleep in middle age linked to increased dementia risk

Herpes infection may have been linked to COVID-19 vaccine, study says

Sleep six hours or less linked to a higher dementia risk, study finds

Herpes infection may be linked to COVID-19 vaccine

Author of study quoting J&J says that she did NOT find clots linked to Pfizer, Moderna

Physical inactivity linked to higher COVID-19 risk; new trial attempts to reinfect virus survivors

Physical inactivity linked to higher COVID-19 risk; new trial attempts to reinfect virus survivors

Two Russian agents linked to genuine poisoning and deadly explosion, but Europe can do little

Russian suspects in Salisbury poisoning linked to explosion in Czech Republic