Tell HN: Covid19 testing rates should be expressed in days

For example, if a country of 4.8 million people tests 12000 people a day, then, assuming that testing is evenly distributed across the whole population, every person will be tested, on average, once every 400 days.

To fully control the spread of disease, the testing rate probably has to be no more than a small multiple of the average incubation period of 5 days, ie 10-20 days.

If we adopt "days" as a standard way of describing testing rates, then it provides a number which everyone can easily compare to the incubation period of the disease.