Impaired long-term antibody persistence after primary immunization with pneumococcal vaccines in patients with chronic lymphocytic leukemia compared to immunocompetent controls
Pneumococcal vaccine
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: Identify all the mentioned drugs in the given text. Text may or may not contain drug. If they contain more than 1 drug, use ";" as delimiter and join them. ### Input: Impaired long-term antibody persistence after primary immunization with pneumococcal vaccines in patients with chronic lymphocytic leukemia compared to immunocompetent controls ### Output: Pneumococcal vaccine