Multidrug resistance gene refers to genes that cause resistance to multiple drugs in organisms, including bacteria and viruses. Synonyms for this term include antibiotic resistance genes, MDR genes, or drug-resistant genes. These genes are often found on plasmids, which can be easily transferred between bacteria, leading to the spread of resistance. Other terms related to multidrug resistance include antimicrobial resistance (AMR) and antibiotic resistance (ABR). As the overuse and misuse of antibiotics continues to be a pressing issue, understanding and monitoring the presence of multidrug resistance genes in pathogenic organisms remains critical to ensuring effective treatments for infections.