The specific hypothesis being tested is that it may be possible to induce a protective humoral immune response with a booster dose of the Moderna COVID-19 vaccine in patients with hematologic malignancies who did not have an adequate response to first vaccination with any of the available COVID-19 vaccines. To test this hypothesis, t a Phase II singlestage trial in which patients with a negative or weak positive anti-SARS-CoV2 IgG antibody test (defined as <1.00 S/CO and 1.00-1.99 S/CO, respectively) will receive a single standard dose of the Moderna COVID-19 vaccine intramuscularly, and then have anti-SARS-CoV2 IgG antibody levels checked 28 days (+/-3 days) later.
To determine whether protective antibody levels increase after booster dosing with the Moderna COVID-19 vaccine in patients diagnosed with Hematologic Malignancies who have low antibody levels after a prior first vaccination with any of the SARS-CoV2 vaccines that were authorized for use in the USA. Researchers will also assess whether the booster dosing with the Moderna COVID-19 vaccine is safe in patients with multiple myeloma, amyloidosis, or other blood cancers.