A Study of a Vaccine in Combination With Beta-glucan in People With Neuroblastoma

The purpose of this study is to test which treatment schedule of β-glucan with bivalent vaccine is more effective for participants with high-risk neuroblastoma that is in complete remission.

Inclusion Criteria: * Diagnosis of NB as defined by international criteria,102 i.e., histopathology (confirmed by the MSK Department of Pathology) or BM metastases plus high urine catecholamine levels, or positivity in MIBG scan. * HR-NB as defined by risk-related treatment guidelines and international criteria,102 i.e., metastatic/non-localized disease with MYCN amplification (any age), metastatic disease \>18 months old, MYCN-amplified localized disease (any age), or disease resistant to standard chemotherapy. For those patients with a positive site of disease that is poorly visualized on a scan, it can be per PI discretion to repeat the scan or proceed with enrollment without a recent scan. * HR-NB (as defined above) and in 1) first CR at ≥ 6 months from initiation of immunotherapy using anti-GD2 antibody, or 2) second or subsequent CR (achieved after treatment for PD). CR is defined according to the International Neuroblastoma Response Criteria. Patients with positive MIBG scan but negative FDG-PET scan, and CR in BM, are eligible. For those patients with a positive MIBG scan, the negative FDG-PET scan can be per PI discretion to repeat within the 45 day window period prior to enrollment. * Patients with grade 3 toxicities or less using the Common Toxicity Criteria (Version 5.0) developed by the National Cancer Institute of the USA (CTCAE v5.0) related to hematologic, cardiac, neurological, pulmonary, renal, hepatic or gastrointestinal function as determined by blood tests or physical exam. Plus: * Absolute neutrophil count (ANC) ≥ 500/mcl * Absolute lymphocyte count ≥ 500/mcl * \>21 and \