Secondly, that epidemiologist person is citing herd immunity yet when our own govt did so the response from WHO and people on MN was different.
WHO gave quite a long answer and also covered the herd immunity thing:
Dr Michael Ryan - With regard to this concept of herd immunity, I think we'll wait. I believe seroprevalence studies are underway in Sweden as well as in many, many other countries and Maria can speak to that because WHO with our partners have done a large review of all of the seroepidemiologic studies that are underway and some of the results that are available.
But I would say that the general outcome; even in areas of fairly intense transmission the proportion of people who have seroconverted or who have antibodies in their blood is actually quite low, which is a concern because it does mean many, the vast majority of people remain susceptible. So the chance of the disease rebounding or returning is quite high, especially if control measures or lock-down-type measures are released too quickly without being replaced by case finding, contact tracing, testing and strong community compliance.
Dr Maria Van Kerkhove - To supplement what Mike said around the herd immunity, right now we're tracking over 90 seroepidemiologic studies that are in various stages of development, whether the countries are just starting the process to implement or whether they're implementing them now. There are some pre-publication papers that have come out that have suggested low seroprevalence, a low percentage of the people they tested that actually have antibodies.
If the tests that they have used are reliable this indicates that a large proportion of the population remains susceptible to COVID-19. That means the virus has more room to move and so it is important that we continue to adhere to these public health measures.
I think we need to wait some time to have a better understanding of how well the serologic tests that are available work. For the countries that we are working with on seroepidemiology we've advised them to store their samples in -20 freezers right now until we can give a better indication of which serologic tests are performing well. But we do hope will have more information about the extent of infection in a number of countries across the globe so we can really understand how far and wide this virus has spread.