What is known from our medical sources: the patient may feel good, but the test will show the presence of the virus and the pathological process in the lungs. The x-ray is uninformative; a computer tomography scanning is better.
The affected parts of the lungs show a process similar to fibrosis. Ventilation of the lungs at this stage will not give a good result, since the lungs would absorb oxygen unsatisfactorily, it is better to supply oxygen directly to the blood through the vein.
Medications for malaria show good results for Covid. Another antiparasitic drug has been identified, it inhibits the reproduction of the virus in the human body. Most likely it will be widely used, since it is already on sale.
Statistically in countries where BCG vaccination is common programm for population, the incidence and mortality rate differs tenfold (according to various sources, 40-60 times).
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I follow the numbers in Russia, I observe a correlation: the number of deaths is about 10% of the recovered. Today it is 232 died and 2304 recovered.
It is difficult to compare the mortality rate with the total number of cases, since the latter figure is growing all the time. The growth rate is also increasing, it may denote that people continue spreading the virus instead of obeying quarantine.