Unvaccinated people at highest risk of being infected by delta variant

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A highly transmittable form of COVID-19 known as the delta variant is spreading globally. Now a subvariant known as delta-plus has been identified.

"Delta-plus just means that there's been an additional mutation in the delta variant," says Dr. Gregory Poland, an infectious diseases physician and researcher at Mayo Clinic. "We have not really seen that take off yet. And that's probably because it's being outcompeted by the delta variant. If you look at the original virus and you say there was a certain amount of infectivity associated with that, the , or alpha variant, was about 50% more infectious than the original virus. The delta virus is 50% to 60% more infectious than the alpha variant."

For the safety of its patients, staff and visitors, Mayo Clinic has strict masking policies in place. Anyone shown without a mask was recorded prior to COVID-19 or recorded in an area not designated for patient care, where social distancing and other safety protocols were followed.

Dr. Poland has served as a consultant for Merck & Co. Inc., Medicago Inc., GlaxoSmithKline plc, Sanofi Pasteur, Emergent BioSolutions Inc., Dynavax Technologies Corp., Genentech Inc., Eli Lilly and Co., Janssen Pharmaceuticals Inc., Kentucky BioProcessing Inc. and Genevant Sciences Corp. Honoraria: Elsevier.

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