Design a birthday card with a surreal illustration combining World War II themes, microbiology, and typography. The foreground should include vibrant and colorful bacteria transforming into balloons and presents. The background should be a sepia-toned depiction of a battlefield. Include the words 'Happy Birthday' floating above the scene, stylized in a vintage font reminiscent of World War II propaganda posters to add a layer of nostalgia to the whimsical composition.

Generated with these themes: WW2, Bacteria, and Fonts.

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