Why has it taken too long to develop a vaccine that prevent transmit of HIV between opposite mature sex partners [man-to woman or vice versa] which humanity has accepted to live with and been adapted and now in a rush to develop a vaccine for COVID-19?
COVID-19, being in the family of SARs, Ebola etc for which a vaccine is available, why not enhance early/prioritize discovery and development of vaccines as a form of emergence preparedness?
COVID-19 immunity results have left the world shocked!
No active immunity and no chances of a vaccine induced passive immunity.
Remember active immunity is longer-lasting and stronger than passive immunity caused by vaccines and convalescent plasma.
All answers in this article
https://www.medrxiv.org/content/10.1101/2020.06.13.20130252v1.full.pdf
Active immunity is longer and stronger than passive immunity caused by vaccines and plasma convalescence. The vaccine will last one season. It will need to be done every year as with seasonal flu.
@ Pushkin Sergey Viktorovich and D. K. Gupta
Point to ponder are:
How much is the season of COVID-19 and are antibodies to SARS-CoV-2 really protective?
Till now, there has been no season for COVID-19, as it has been going relentlessly during the seasons it has seen. If you read the article in my answer above closely, the people with more antibodies were more sick and the one with less antibodies were relatively better. Older people were more likely to develop antibodies compared to younger.
Still nobody is sure that the antibodies are really protective. An example is another RNA virus, Hepatitis C virus, where the HCV-antibodies do not indicate immunity.