What fraction of the population needs to be immune to SARS-CoV-2 to achieve 'herd immunity. > 30% > 10% > 50% > 70% > 20%

DTT and 2-ME would destroy which of the following antibodies? Group of answer choices Anti-Duffy Anti-E Anti-C Anti-Lea

People with type AB blood have A antigen, B antigen, and O antigen on the surface of all of their red blood cells. According to what you know about self-tolerance, which NON-SELF antibodies do they allow to SURVIVE in the tolerance tests mentioned in Objective 12? Mark all that apply. Group of answer choices anti-A anti-B anti-O none of the above

The CD4+ T-cell is can directly kill pathogens True O False