Home > Our Body > Viruses – An Explanation About What They Are Viruses – An Explanation About What They Are Our Body Share on Pinterest Professor Dave talksĀ about viruses and what exactly a virus is. Are they alive and how do they infect a host spreading diseases? Share on Pinterest Related Posts Inside the Lab That Invented the COVID-19 Vaccine 30 Facts About The Human Body You May Not Know Why Do We Have Different Blood Types? Why Do We Laugh? Where Did Viruses Come From?