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immune protection system. bacteria, virus infection
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World Immunization Week is an annual global event celebrated every last week of April to highlight the importance of vaccines in protecting people. Stethoscope and Earth, syringe, vaccine.Vector eps10
Vector illustration of shield with health cross and two strong fists. Icon of immunity booster. Symbol of immune protection.
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Types of T cell. T lymphocytes. Memory, helper, suppressor and cytotoxic T cells. Adaptive immunity. The Immune System.

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