Letter from JD Cash (National Medical Director SNBTS) to W Whitrow (Director Inverness BTS) regarding recent developments in HTLV-III antibody testing. Cash notes that a Public Health Laboratories study has found that Organon and Wellcome Diagnostics-manufactured kits are the only ones they [PHLS] can recommend for field...evaluation. The letter also discusses timescales for full scale donation screening, contracts for HTLV-III testing kits, kit performance monitoring, donor counselling, consent forms for donors to be tested and letters to donors to inform them of the commencement of HTLV-III antibody screening.