PubMed – The Shadows

Rapid Progression

https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC8656165/

Mechanisms of Evolution

https://pubmed.ncbi.nlm.nih.gov/34873910/

Risk for Transmission

https://pubmed.ncbi.nlm.nih.gov/32790510/

UP to 30%

https://pubmed.ncbi.nlm.nih.gov/15322523/

May Account for Almost Nine of Ten

https://pubmed.ncbi.nlm.nih.gov/33260798/