![Doctor and senior woman wearing facemasks during coronavirus and flu outbreak. Virus protection. COVID-2019..](https://www.mcknights.com/wp-content/uploads/sites/5/2021/10/GettyImages-1280184645-860x484.jpg)
Pfizer vaccine’s deep-freeze storage and second shot may be unnecessary … For-profit nursing homes are ‘worst performers’ in COVID infection control analysis … Researchers pinpoint too-low diastolic blood pressure target … First human clinical trial launched with in-brain delivery of gene therapy for Alzheimer’s disease