Table 1.

Comparison of two strains of D29 and two sources of ferrous ammonium sulfate (FAS)

		Plaque #
	D29 pfu/ml	D29: U. Pittsburgh	D29: Queens U. Belfast
Positive Control	102	92	98
	10	10	17
	1	1	1
FAS USA	108	14	0
	108	21	0
	108	23	0
FAS EUROPE	108	20	0
	108	23	0
	108	23	0

A comparison of two sources of mycobacteriophage D29, (see Materials and methods) with two sources of the virucide, ferrous ammonium sulfate (see Materials and methods). Satisfactory viricidal action was only achievable with D29 sourced from Queens University Belfast, (see example in Fig. 1a). As a consequence, the QUB D29 was used in all subsequent experiments. PFU: Plaque Forming Units