evere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused the global COVID-19 pandemic infecting more than 111 million people and causing 2.4 million deaths. Clinical disease in humans ranges from asymptomatic infection to pneumonia, severe respiratory compromise, multi-organ failure and systemic inflammatory syndromes. The rapid expansion and prolonged nature of the COVID-19 pandemic and its accompanying morbidity, mortality and destabilizing socioeconomic effects have made the development of SARS-CoV-2 therapeutics and vaccines an urgent global health priority 1. Indeed, the emergency use authorization and rapid deployment of antibody-based countermeasures, including mAbs, immune plasma therapy and messenger RNA, and inactivated and viral-vectored vaccines has provided hope for curtailing disease and ending the pandemic. The spike protein of the SARS-CoV-2 virion binds the cell-surface receptor angiotensin-converting enzyme 2 (ACE2) to promote entry into human cells 2. Because the spike protein is critical for viral entry, it has been targeted for vaccine development and therapeutic antibody interventions. SARS-CoV-2 S proteins are cleaved to yield S1 and S2 fragments. The S1 protein includes the N-terminal (NTD) and receptor-binding (RBD) domains, whereas the S2 protein promotes membrane fusion. The RBD is recognized by many potently neutralizing monoclonal antibodies 3-7 , protein-based inhibitors 8 and serum antibodies 9. The current suite of antibody therapeutics and vaccines was designed with a spike protein based on strains circulating during the early phases of the pandemic in 2020. More recently, variants with enhanced transmissibility have emerged in the United Kingdom (B.1.1.7), South Africa (B.1.351), Brazil (B.1.1.248) and elsewhere with multiple substitutions in the spike protein, including in the NTD and the receptor-binding motif (RBM) of the RBD. Preliminary studies with pseudoviruses suggest that neutralization by some antibodies and immune sera may be diminished against variants expressing mutations in the spike gene 10-13. Given these

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused the global COVID-19 pandemic infecting more than 106 million people and causing 2.3 million deaths. The rapid deployment of antibody-based countermeasures has provided hope for curtailing disease and ending the pandemic1. However, the emergence of rapidly-spreading SARS-CoV-2 variants in the United Kingdom (B.1.1.7), South Africa (B.1.351), and elsewhere with mutations in the spike protein has raised concern for escape from neutralizing antibody responses and loss of vaccine efficacy based on preliminary data with pseudoviruses2-4. Here, using monoclonal antibodies (mAbs), animal immune sera, human convalescent sera, and human sera from recipients of the Pfizer-BioNTech (BNT162b2) mRNA vaccine, we report the impact on antibody neutralization of a panel of authentic SARS-CoV-2 variants including a B.1.1.7 isolate, a chimeric Washington strain with a South African spike gene (Wash SA-B.1.351), and isogenic recombinant variants with designed mutations or deletions at positions 69-70, 417, 484, 501, and/or 614 of the spike protein. Several highly neutralizing mAbs engaging the receptor binding domain (RBD) or N-terminal domain (NTD) lost inhibitory activity against Wash SA-B.1.351 or recombinant variants with an E484K spike mutation. Most convalescent sera and virtually all mRNA vaccine-induced immune sera tested showed markedly diminished neutralizing activity against the Wash SA-B.1.351 strain or recombinant viruses containing mutations at position 484 and 501. We also noted that cell line selection used for growth of virus stocks or neutralization assays can impact the potency of antibodies against different SARS-CoV-2 variants, which has implications for assay standardization and congruence of results across laboratories. As several antibodies binding specific regions of the RBD and NTD show loss-of-neutralization potency in vitro against emerging variants, updated mAb cocktails, targeting of highly conserved regions, enhancement of mAb potency, or adjustments to the spike sequences of vaccines may be needed to prevent loss of protection in vivo.

Renal adverse drug reactions from sodium phosphate tablets are more common in women with a mean body weight lower than the national average weight.

Endoscopic Procedures in Colon and Rectum 18 followed by repeated procedures. In a study of 200 consecutive outpatient colonoscopies, imperfect bowel preparation resulted in a 12% increase in costs at a university hospital and 22% increase in costs at a public hospital (Rex et al., 2002). Types of bowel preparationsThe ideal colon preparation should rapidly and reliably cleanse the colon of fecal material while having no effect on the gross or microscopic appearance of the colon (Wexner et al., 2006). It should require a short period for ingestion and evacuation, cause no discomfort, and produce no significant fluid or electrolyte shifts while also being palatable, simple, and inexpensive. Agents used for bowel preparation can be divided into three main categories according to their mechanism of action, these being isosmotic, hyperosmotic, and adjunctive preparations. Polyethylene glycol-electrolyte lavage solutions (PEG-ELSs) and sodium phosphate (NaP) formulations are among the most commonly used. 2.2

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