What is cool about O+?

Why O+ Donors Are True Heroes for Newborns

Not all blood is the same when it comes to saving the tiniest lives—and that’s where O positive donors shine. While O positive blood is already the most commonly needed blood type, there’s an even more special group within this category: those who are also CMV negative.

CMV, or cytomegalovirus, is a common virus that most people carry without ever knowing. But for newborns—especially those with underdeveloped or compromised immune systems—it can be dangerous. That’s why the Red Cross gives special recognition to O positive donors who are CMV negative, calling them “Heroes for Babies.”

When a premature infant or a newborn with a medical condition needs a transfusion, the safest option is blood that won’t introduce any additional risk. O positive, CMV-negative blood fits the bill perfectly. It’s not only widely compatible but also free of a virus that could overwhelm a fragile immune system.

Becoming a “Hero for Baby” doesn’t require anything beyond a simple blood donation—you’re either CMV negative or you’re not, based on your medical history and testing at donation. But the impact is enormous. Every unit of blood donated by someone with this rare combination can be lifesaving in neonatal intensive care units across the country.

It’s a quiet kind of heroism—no capes, no headlines—but one that makes all the difference in the first, crucial days of a child’s life. The next time you consider donating blood, remember: if you’re O positive, you might already be part of an elite group. And if you're CMV negative too? You're not just giving blood—you're giving babies a fighting chance.