So, the WHO have poured cold water on the usefulness of anti-body tests.

But the WHO cautioned against investing too much in these tests.

Speaking in Geneva, the WHO's Dr Maria van Kerkhove said there was "no evidence" that having had the virus would guarantee immunity.

She said initial evidence did not suggest large numbers of people were developing antibodies after having the virus, meaning the chances of creating "herd immunity" were not high.
This is concerning, we really need to see evidence that the virus provides some sort of immunity. Otherwise, we may be facing periods of lockdown for a long time.