ABSTRACT
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has evolved into numerous lineages with unique spike mutations and caused multiple epidemics domestically and globally. Although COVID-19 vaccines are available, new variants with the capacity for immune evasion continue to emerge. To understand and characterize the evolution of circulating SARS-CoV-2 variants in the U.S., the Centers for Disease Control and Prevention (CDC) initiated the National SARS-CoV-2 Strain Surveillance (NS3) program and has received thousands of SARS-CoV-2 clinical specimens from across the nation as part of a genotype to phenotype characterization process. Focus reduction neutralization with various antisera was used to antigenically characterize 143 SARS-CoV-2 Delta, Mu and Omicron subvariants from selected clinical specimens received between May 2021 and February 2023, representing a total of 59 unique spike protein sequences. BA.4/5 subvariants BU.1, BQ.1.1, CR.1.1, CQ.2 and BA.4/5 + D420N + K444T; BA.2.75 subvariants BM.4.1.1, BA.2.75.2, CV.1; and recombinant Omicron variants XBF, XBB.1, XBB.1.5 showed the greatest escape from neutralizing antibodies when analyzed against post third-dose original monovalent vaccinee sera. Post fourth-dose bivalent vaccinee sera provided better protection against those subvariants, but substantial reductions in neutralization titers were still observed, especially among BA.4/5 subvariants with both an N-terminal domain (NTD) deletion and receptor binding domain (RBD) substitutions K444M + N460K and recombinant Omicron variants. This analysis demonstrated a framework for long-term systematic genotype to antigenic characterization of circulating and emerging SARS-CoV-2 variants in the U.S., which is critical to assessing their potential impact on the effectiveness of current vaccines and antigen recommendations for future updates.
ABSTRACT
OBJECTIVES: To assess the effectiveness of a chaplain patient navigator in improving outcomes and reducing costs in the ICU setting. DESIGN: A randomized controlled trial at a large, urban, academic community hospital in Baltimore, Maryland. SETTING/PATIENTS: All patients admitted to the Johns Hopkins Bayview Medical Center Cardiac and Medical ICUs between March 2015 and December 2015. INTERVENTIONS: Patients in the intervention group were assigned a chaplain patient navigator to facilitate communication, offer support, and setup multidisciplinary family meetings. MEASUREMENTS AND MAIN RESULTS: The primary outcomes were hospital and ICU length of stay. Secondary outcomes included total and ICU charges, 60- and 90-day readmission rates, and the number of palliative care consults. For all outcomes, patients were included in the intention-to-treat analyses only if they remained in the ICU greater than 24 hours. In total, 1,174 were randomly assigned to "usual care" (n = 573) or to the intervention (n = 601). In the intervention group, 44.8% (269/601) had meetings within 24 hours of admission and, of those patients, 32.8% (88/268) took part in the larger multidisciplinary family meeting 2-3 days later. The intervention group had longer mean adjusted hospital length of stay (7.78 vs 8.63 d; p ≤ 0.001) and mean ICU length of stay (3.65 vs 3.87 d; p = 0.029). In addition, they had greater total and ICU charges. There were no differences in other outcomes. Of note, only differences in total and ICU charges remained when controlling for case-mix index, which were greater in the intervention group. CONCLUSIONS: Although the chaplain patient navigator anecdotally enhanced communication, our study found an increase in hospital and ICU length of stay as well as cost. Since other studies have shown benefits in some clinical outcomes, projects focused on patient navigators may learn lessons from our study in order to better prioritize family meetings, gather indicators of communication quality, and identify the optimal patient navigator operational context.