# Blood for transfusion containing Category A infectious substance — Postal shipping restrictions by item category

For Blood for transfusion containing Category A infectious substance, carrier is USPS; restriction type is prohibited; scope is all mail; conditions is Blood collected for transfusion and known or suspected to contain a Category A infectious substance is nonmailable, recorded from its source on 2026-08-04.

- **Item category:** Blood for transfusion containing Category A infectious substance _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** Blood collected for transfusion and known or suspected to contain a Category A infectious substance is nonmailable _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Blood for Transfusion: Blood collected for transfusion and known or suspected to contain a Category A infectious substance.

## Source

- https://pe.usps.com/text/pub52/pub52c3_025.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).