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What are viruses? Viruses are microscopic organisms that require hosts such as plants, bacteria and animals. A virus is typically 20 nanometres to 400 nanometres in diameter. Like all other organisms, a virus is made up of DNA (Deoxyribonucleic acid) or RNA (Ribonucleic acid) but is surrounded by a defensive coat called a “capsid”. SomeContinue reading “A pandemic more often – how global warming may awaken long gone viruses.”