This prospective observational study aims to evaluate the robustness and persistence of immune responses to vaccination, define factors associated with impaired immune responses and assess the incidence of COVID-19 infections in vaccinated individuals. To do this, we will collect peripheral blood from patients with lymphoid cancers before and after their COVID-19 vaccination. The blood will be explored in the laboratory for antibodies to SARS-CoV-2 and T-cell responses to the spike protein. Detailed clinical information will also be collated on about their cancer and treatment.

INCLUSION CRITERIA

1. Patients having a confirmed diagnosis of either:

   A) Hodgkin lymphoma B) Aggressive B-cell lymphoma (e.g. Burkitt's lymphoma, diffuse large B-cell lymphoma, grade 3b follicular lymphoma, de novo transformed follicular lymphoma) C) Indolent B-cell lymphoma (e.g. all grades of follicular lymphoma except grade 3b, marginal zone lymphoma, lymphoplasmacytic lymphoma, chronic or small lymphocytic lymphoma, mantle cell lymphoma) D) Mature T/NK-cell malignancy (any subtype)

2. Patient must be ≥ 18 years.

3. Patients will have provided written Informed Consent.

EXCLUSION CRITERIA

1) Serious medical or psychiatric illness likely to affect participation or that may compromise the ability to give informed consent.

All patients with a confirmed lymphoma diagnosis who is under the care of a secondary or tertiary referral centre.