SUMMARYSome characteristics of a microplate method for the detection and assay of plant viruses using enzyme-labelled antibodies are described. The method enabled the highly sensitive detection of a number of morphologically different viruses in purified preparations and in unclarified extracts of herbaceous hosts and of infected crop plants. Virus concentrations were estimated by photometric measurement of the colour intensity of the hydrolysed substrate. The suitability of the technique for various field and research applications is considered.

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Further high quality studies are required to inform policy and practice for mental health service users, which lags behind other adult social care groups in the use of personal budgets.

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