I highly recommend reading the entire article.
'Something we've never seen before': Scientists still trying to understand baffling, unpredictable coronavirus
MILWAUKEE – The new coronavirus has spread like wildfire, killed — and spared — people of all ages and all health conditions, baffled doctors, defied guidance and conventional wisdom, and
produced an unprecedented array of symptoms.
There's never been a virus like it.
"This gets into every major biological process in our cells," said Nevan J. Krogan, a molecular biologist at the University of California, San Francisco, who has studied HIV, Ebola, Zika, dengue and other viruses over the last 13 years.
“At the molecular level, it's something we've never seen before, and then look at what it does to the body — the long list of symptoms — we've never seen that before."
As Americans debate the reopening of businesses, bars, schools and other aspects of everyday life, it's important to understand the virus we are up against and why it has sown so much suffering and confusion.
At first, the virus was thought to be mostly a risk to older adults and people with chronic illnesses; its primary point of attack, the lungs. Then 30- and 40-years-olds with the virus began dying of strokes. Recently, a small number of infected children have died of a mysterious
illness resembling Kawasaki disease.
To understand a virus' "motivation" — why it does what it does — keep in mind that it is a parasite. It lives inside its human or animal host taking what it needs at the expense of the host.
As long as it finds hosts without immunity, and as long as its own mutations do not weaken its ability to spread and multiply, the virus thrives.
Key benchmarks of a virus are how widely it spreads and how deadly it is to those it infects.
In the five months since it was first identified in Wuhan, China, SARS-CoV-2 has infected more than 4.5 million people across the globe, killing more than 300,000.
"The thing that strikes me about the clinical aspect is the shear amount of transmissibility," said Megan Freeman, a virologist and specialist in pediatric infectious diseases at UPMC Children's Hospital of Pittsburgh.