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What do salmonella, wasp venom, and the flu have in common? They all cause our immune systems to spring into action. Give your students a primer on how their bodies respond to each of these antigens. Bacteria: Salmonella is one of the most common types of bacteria. See how these germs are passed from host to unsuspecting host, allowing them to spread by attacking individual cells and multiplying. Allergies: One person's painful sting can be another person's life-threatening attack. Find out what happens when a wasp sting causes an extreme form of allergic reaction known as anaphylactic shock. Viruses: Follow the journey of the flu virus as it attacks the cells in Holly Jones's throat and replicates itself millions of times. See how her body fights back with a secret weapon that ultimately kills this invading virus.