Category B Infectious substances are not in a form generally capable of causing permanent disability or life-threatening or fatal disease in otherwise healthy humans or animals when exposure to it occurs (49 CFR 137.134 (a) (1) (ii), TDGD 1.4, IATA 18.104.22.168.2.2, ICAO 2;6 22.214.171.124)
Specimen Transport Packaging
Patient specimens that are not likely to contain a pathogen are classified as “Exempt human specimens” or “Exempt animal specimens”, as appropriate. In order to classify a patient specimen as Exempt, professional judgment is required. Factors such as the known medical history, symptoms and individual circumstances of the source (human or animal), and endemic local conditions MUST be considered.