Maybe you should stop licking door knobs?
The point is, nobody knows if licking door knobs will create immunity to this. It’s drawing parallels to what you think you already know, putting you self and others at risk.
“A study on recovered COVID-19 patientsin the southern Chinese city of Shenzhen found that 38 out of 262, or almost 15% of the patients, tested positive after they were discharged. They were confirmed via PCR (polymerase chain reaction) tests, currently the gold standard for coronavirus testing. The study has yet to be peer reviewed, but offers some early insight into the potential for re-infection. The 38 patients were mostly young (below the age of 14) and displayed mild symptoms during their period of infection. The patients generally were not symptomatic at the time of their second positive test.” - Link
Jumping to unproven conclusions is hardly being informed. It is exactly what will keep this thing going or fuel subsequent waves. Until scientists give me the thumbs up to start licking door knobs, I’ll leave that weird little task to you.