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Looking for an accurate TPHA test? : and an incubation time of only 45 minutes? Wellcosyph HA has been developed specifically to reduce your TPHA turnaround time ... / Wellcome Diagnostics, a division of the Wellcome Foundation Lmited, Temple Hill, Dartford, England ... Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.