Not sure if this is new, but the 2022 State Dept compliance report contains a definition of a BW program:

The United States’ definition of a state biological warfare (BW) program is a leadership-approved effort intended to acquire, develop, modify, produce, or retain biological warfare agents for use or potential use as a weapon. A biological warfare program would probably include one or more of the following:

Researching, acquiring, developing, modifying, producing, retaining, or testing BW agents and/or BW agent dispersal devices for use as a weapon;

Facilities producing or intended to produce BW agents and/or BW agent dispersal devices for use as a weapon;

Training, doctrine, or plans for use of BW agents as a weapon; and,

Use or attempted use of a BW agent as a weapon.