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Why does the Immune Deficiency Foundation say, “THINK ZEBRA!”?

When doctors go to school, they learn the saying, “When you hear hoof beats, think horses, not zebras.” This means, when doctors treat people they should think about common illnesses, not unusual ones. However, sometimes people get sick a lot, their illness doesn’t get better or they have an unusual infection. When this happens, doctors should wonder whether the person might be a zebra with an unusual condition, like primary immunodeficiency disease, and not a horse with a common infection. People with primary immunodeficiency diseases are the zebras of the medical world! Help IDF teach everyone to THINK ZEBRA! “When you hear hoof beats, think zebras, not horses.”

Show us your stripes – in a colorful way!

Click here to download our black and white zebra coloring page! Print it out, color it, and send it to:, or mail it to Immune Deficiency Foundation, 110 West Road, Suite 300, Towson, MD 21204 and we may feature it on our website! Don’t forget to also send us your zebra jokes and fun facts.

Zebra Jokes

What is the silliest name you can give a zebra?
Answer: Spot!

If a four-legged animal is a quadruped and a two-legged animal is a biped, what’s a zebra?
Answer: Stri-ped

What’s black and white and noisy?
Answer: A zebra with a set of drums

Do you have a zebra joke for IDF? Send it to and we’ll add it to the IDF Zebra Zone for others to enjoy!

Fun Fact

Every zebra has a unique pattern of stripes, just as every person has a unique pattern of fingerprints.