What is the maximum quantity of a solid Category A Infectious substance permitted per package on a passenger aircraft?

• A. 50 mL
• B. 50 g
• C. 4 L
• D. 4 kg

Answer: (B)

The important rule here is the quantity limit per package for solids classified as Category A infectious substances when shipped on a passenger aircraft. For a solid, the maximum allowed amount in one package on a passenger flight is 50 grams. This small limit is set to minimize risk in case the package is damaged or mishandled, reducing the potential exposure to people handling the package and to crew in the cabin.

Think of the difference between solids and liquids: liquids have their own lower per-package limits (such as 50 milliliters) due to the higher risk of leakage and spread, while larger quantities like 4 liters or 4 kilograms are not permitted on passenger aircraft for these substances. The 50-gram limit for solids aligns with safety practices that balance practical shipping needs with the need to keep exposure risk very low during air travel.