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Thanks for your query.
Immunity to a specific disease is almost always attained by vaccination or natural infection.
Overall Immunity implies not only the blood-related immunity but physical too. A fit body with all other pre-existing comorbidities under control, prevention or treating any deficiencies if present especially Vit D deficiency. These corrections imply improved immunity.
Daily exercises and mind relaxation exercises like meditation also count as measures to improve immunity. Hence, there is no short cut or a specific medicine which improves immunity. Overall health is necessary to have good immunity.
Hope, I answered your query.
Wish you good health.