1.1 ,This test method describes a procedure that can be used in the field or in a laboratory to detect antigens indicative of microbial contamination in liquid fuels, including those blended with synthesized hydrocarbons or biofuels, with kinematic viscosities (at 40 ,°,C) of ≤,24 ,mm²s^–,1 (for example, Specifications D396, D975, and D1655) and in fuel-associated water.