U.S. reportedly sets time to renew COVID shots at 8 months, while Pfizer releases trial data in bid to expand booster shot access … Patients taking type 2 diabetes drugs may have fewer Alzheimer’s brain biomarkers … U.S. COVID cases return to pre-vaccination levels … Antibiotic stewardship linked to reduced readmission, mortality for hospitalized seniors … Saliva-based RT-PCR tests should not be used for asymptomatic COVID screening, study suggests