WHN graphic with a dark background and the whn.global logo at top left. Large headline: “COVID isn’t seasonal — it’s opportunistic.” Subtext: “It spreads fast, especially indoors with poor air. But healthy routines like masking, clean air, and testing when sick can help keep us healthier all year.” Footer line: “The World Health Network is a network devoted to global compassion—working together to inspire collective action through science for a safer, healthier world.”