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This makes several useful points about cohort. Are we comparing apples with apples? Are the cohort selection criteria the same from state to state and country to country.

The answer is clearly NO regarding country to country.

Something is going badly wrong in USA
In the U.K. the Dept of Health are correctly imposing a nationally coherent strategy with common surveillance software.

As is evident from the embedded thread, in the USA they cannot say with any certainty how many people have been tested in each state and county.
So who knows what meaning to attach to positive tests?

Firstly. Why would the CDC or states or counties seek to conceal the number of tests being carried out?

I can’t think of a good scientific reason.

Political ones maybe..but not good for citizens.
Are they even applying the same protocol and the same dataset right across the country?

What common fields are recorded that are comparable?

With a 5.6% mortality rate (Hubei, the epicentre, is 4.2%) they SHOULD be worried.
Do they test those who were admitted with one respiratory infection suspected and who subsequently died or not?

If not they may well be unaware of or deliberately turning a blind eye to true mortality rates.

I doubt many believe the data coming from Iran.
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