UNunnums
3549

UN 3549Medical waste, category A, affecting humans Medical waste, category A, affecting animals

Division 6.2

Infectious substances

Summary

UN 3549 is the UN number for medical waste, category A, affecting humans Medical waste, category A, affecting animals. It is classed in Division 6.2 (infectious substances) of Class 6 for transport. Emergency responders use ERG guide 158.

Emergency response

The Emergency Response Guidebook (ERG2024) guide for this number:

  • Guide158Medical waste, category A, affecting animals only, solidMedical waste, category A, affecting humans, solid

From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.

Identification

UN number
UN 3549
Name
Medical waste, category A, affecting humans Medical waste, category A, affecting animals
Hazard class
Class 6: Toxic and infectious substances
Division
6.2: Infectious substances
What the class covers
Substances known or reasonably expected to contain pathogens.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3549Medical waste, category A, affecting humans Medical waste, category A, affecting animals

    , solid or; only, solid

    Special provisions: 131, 430

    Class
    6.2
    Packing group
    None
    Labels
    6.2

From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.

About Class 6

Class 6 covers poisons and infectious material. Division 6.1 is toxic substances that harm people if swallowed, inhaled or absorbed through the skin; 6.2 is infectious substances such as cultures and medical waste.

See all Class 6 UN numbers

Check the official sources

For emergency response, packaging and quantity limits, use these: