Effect of Obesity on Immune Response to Pneumovax 23

All participants will receive a single 0.5 mL Pneumovax 23 intramuscular vaccine at baseline.

All participants will have two 50 milliliter blood draws: at baseline and up to 6 weeks later.

"All participants will answer the following questionnaires:~UCLA Loneliness Scale Questionnaire will be used to measure a difference between the groups.~Perceived Stress Scale-10 Questionnaire will be used to measure a difference between the groups.~Interpersonal Support Evaluation List-12 will be used to measure a difference between the groups Life Orientation Test-Revised will be used to measure a difference between the groups."