Emerging evidence of vaccine efficacy will impact vaccine availability – Keith Cloete Search Polity Note: Search is limited to the most recent 250 articles. To access earlier articles, click Advanced Search and set an earlier date range. To search for a term containing the '&' symbol, click Advanced Search and use the 'search headings' and/or 'in first paragraph' options. With... Clear Search Sponsored by Sponsored by Western Cape Department of Health head Keith Cloete warned on Thursday that the emerging evidence on vaccine efficacy against the 501Y.V2 Covid-19 variant would impact on vaccine availability over the coming months. Cloete was speaking during the Western Cape’s virtual update on Covid-19 in the province, held by the province’s Premier