Biology

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ACE2 receptor - enzyme attached to the cell membrane of cells in the lungs, arteries, heart, kidneys and intestines. Responsible for lowering blood pressure by catalyzing the hydrolysis of angiotensin II into angiotensin

Case fatality rate (CFR) = of all people who have tested positive, how many died (deaths of confirmed cases / cases)

Infection Fatality Rate (IFR) = of all people who we think have been infected, how many people died (deaths/infected estimate)

How Biodiversity Prevents Pandemics

Biodiversity maintains a well working system. Circle of life. 
Cut down the trees and the birds leave
The birds leave, there's nothing controlling the ticks. Birds eat ticks.
Ticks can carry microorganisms and pass them to mammals such as dogs
Dogs then can pass an antigen to humans.

if the genetic diversity of the affected populations is low the invading microorganisms, will suddenly expand and create epidemic outbreaks with risks of pandemic. So biodiversity appears to function as an important barrier (buffer), especially against disease-causing organisms, which can function in different ways.

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