Biological defence, also referred to as biosecurity, is a vital aspect of protecting our health and the environment from potential biological threats. Some common synonyms for biological defence include bio-defence, biological protection, biosecurity measures, and biological containment. These terms are often used interchangeably, all referring to the essential measures undertaken to prevent the spread of biological harm. Biological defence includes various practices such as quarantine, disinfection, and sanitization in different sectors like agriculture, healthcare, and military. With the constant threat of emerging infections and biological weapons, it is important to remain vigilant and proactive in our efforts to establish and maintain robust biological defence systems.