Old Blood and Infections

Right now, medical professionals say blood can be stored for up to 42 days.

In their study of more than 400 ICU patients, doctors found those who received the older blood are twice as likely to develop serious infections compared to those who get "fresher" blood.

The reason, blood at least two weeks old releases something called cytokines.

Those dampen the immune system, making you more likely to get infected.

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