Infection rates
Currently thinking is that each infected person infects between 1.4 and 2.5 other people. (WHO, 4 April 2020).
The infection rates are for people who have been tested and found to be infected.
This figure does not include those who have had mild symptoms but not been tested.
The only way to find the real infection rate is to mass test to identify people with Covid-19 antibodies (produced by the body's immune system when it fights off the infection).
[Work is currently in progress to create a reliable test kit and produce it in sufficient numbers to carry out mass testing.]
How you get immunity - a simple explanation (Zania Stamataki in The Guardian, 10 April 2020)
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