&amp;lt;i&amp;gt;In-vitro&amp;lt;/i&amp;gt; antibacterial sensitivity of &amp;lt;i&amp;gt;Usnea barbata&amp;lt;/i&amp;gt; lichen extracted with methanol and ethyl-acetate against selected &amp;lt;i&amp;gt;Staphylococcus&amp;lt;/i&amp;gt; species from milk of cows with mastitis
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