LyrArc Article Gist
The critical variable in knowing whether lockdowns of cities and countries are working is called the coronavirus RO, or reproduction ratio. This ratio measures the average number of people infected by a carrier A. It could be that he infects 1 person at work and transport call it B people , or in large gatherings call it C people he infects 2 persons, or in other surroundings such as restaurants he infects 1 person call it D people. The people A has infected B+C+D are the ones now not infected by A with the lockdowns such as in New York, Italy, Germany, UK and France. It is determined by global health experts that the number of B+C+D is about an average of 4 persons infected by 1 person A with coronavirus, though it may be much higher in practice in some areas.

The natural rate of RO or reproduction ratio is considered by the European Centre for Disease Prevention and Control to be 3.86 or about 4, if no lockdown or social distancing or other prevention is practiced. This in a situation where people behaved as before unaware that the virus was around them. Governments such as New York and France, UK, Germany are including this key variable in their determination of how long a lockdown lasts, and for determining if the reopening is not going the right way or failing. In such situations the lockdown would be reinstated, or if it is a phased reopening such as in the U.S. and other countries go back to the previous phase.

In Italy and Germany the RO reproduction ratio for coronavirus is estimated by official experts at 0.8. Germany's RO estimated by the Robert Koch Institute and Italy's by Franco Locatelli, scientific advisor to the government. In New York the margin is thin- with RO of 0.9, estimate from the state's governor. In France which has one of the tightest lockdowns of all with a document required to go outside it is at 0.6, the figure coming from the prime minister Mr. Philippe. In the UK it is below 1.0 but no accurate figure is reported.

As Dr. Birx- leading the coordinated response in the U.S. - emphasizes over and over again this is a very contagious virus, about which not much is known. Social distancing, wearing masks, basic prevention measures such as frequent handwashing, and not gathering in large numbers of people, is essential for defeating this virus. This has to be followed up with extensive testing and contact tracing to win this fight.