Prevalence of &amp;lt;i&amp;gt;Escherichia coli&amp;lt;/i&amp;gt; and &amp;lt;i&amp;gt;Salmonella spp&amp;lt;/i&amp;gt; Strains Isolated from Chicken Feces and Their Resistance to Antibiotics by Cefotaximase (CTX-M) Enzyme Production