Not yet known. Neutralisation tests required, not just positive antibody tests.
Dear Sajjad Issa and all. You can know many of the answers to the question on immunity after Coronavirus (COVID-19) on Researchgate:
What is the duration of immunity after recovery from COVID-19?
https://www.researchgate.net/post/What_is_the_duration_of_immunity_after_recovery_from_COVID-19
Yes, SARS-CoV-2 Coronavirus infection can induce permanent immunity after recovery if a healthy person produces a number of antibodies that successfully neutralize the virus after infection. In addition, the second important issue is the answer to the question: Will there be other, equally dangerous, new versions of the SARS-CoV-2 Coronavirus causing Covid-19 in the years to come after mutations? We currently don't know the answer to this question.
Regards,
Dariusz Prokopowicz
lot to go for identify and understanding of after effects of covid recoveries.
More questions than answers about immunity after recovery from COVID-19.
Latest from JAMA:
Article COVID-19 and Postinfection Immunity: Limited Evidence, Many ...
As evidenced by the latest research, the immunity to COVID-19 after recovery is very soft, and not solid.
In the same vein, no hope of durable COVID-19 vaccine, no immunity passport, and convalescent plasma works in some other way if it works at all. Seconf infections can also occur.
https://www.medrxiv.org/content/10.1101/2020.06.13.20130252v1.full.pdf
Please have a look at the following RG links.
Article Clinical and immunological assessment of asymptomatic SARS-C...
Preprint Longitudinal evaluation and decline of antibody responses in...
Unfortunately at present it seems that COVID-19 does not induce long lasting immunity. This is problematic for vaccine development...