---
type: restriction
id: usps-category-a-infectious-substances-un2814-un2900
asset: shipping-restrictions-by-class
title: "Category A infectious substances (UN2814, UN2900) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_025.htm
source_quote: "Category A: An infectious substance transported in a form capable of causing permanent disability or life-threatening or fatal disease in otherwise healthy humans or animals when exposure occurs. Category A infectious substances are nonmailable."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Category A infectious substances (UN2814, UN2900)"
carrier: "USPS"
restriction_type: "prohibited"
scope: "all mail including international"
conditions: "Category A infectious substances (capable of causing permanent disability or life-threatening disease in healthy humans/animals) are nonmailable"
verified: false
unverified_fields: carrier, item_category, scope
---
**Item category:** Category A infectious substances (UN2814, UN2900)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail including international

**Conditions:** Category A infectious substances (capable of causing permanent disability or life-threatening disease in healthy humans/animals) are nonmailable

> Category A: An infectious substance transported in a form capable of causing permanent disability or life-threatening or fatal disease in otherwise healthy humans or animals when exposure occurs. Category A infectious substances are nonmailable.

Source: <https://pe.usps.com/text/pub52/pub52c3_025.htm>