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Questions about the immune system are particularly common during the flu season: How can one’s own defenses be strengthened? Do expensive preparations from the pharmacy really help? In this episode of WELT HEALTH, presenter Franca Lehfeldt and virologist Prof. Hendrik Streeck explain how the immune system works and how you can protect yourself against certain pathogens. They unmask common myths about the body’s own defenses and show when and how vaccination can help.