Polymerase chain reaction detection of caecal bacteria in case of preventive application of &lt;i&gt;Enterococcus faecium&lt;/i&gt; EK13 against &lt;i&gt;Salmonella enterica&lt;/i&gt; subsp. &lt;i&gt;Enteritidis&lt;/i&gt; in chickens
Journal of Animal and Feed Sciences