It looks like I was not making my usual former 10K! I did not track the distance during the runs - it interrupts my audio-books, and I prefer to look at it later - and assumed that the distance I measured earlier was enough. Now I need to run about 1 km further to add 2K and make sure I make over 10 km (6.2 miles). There are a few days left in December, so maybe I could add a few 10s in my list.
A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
There are millions types of viruses, ~ 5,000 virus species have been described in detail. Viruses are found in almost every ecosystem and are the most abundant type of biological entity. The origins of viruses in the evolutionary history of life are unclear.
While not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent particles, virions, which consist of the genetic material made from either DNA or RNA, a protein coat, and in some cases an outer coat of lipids. Virion is about one one-hundredth the size of a bacterium.