You clearly have not read much biology - this disease is a symptom of the presence of problematic protein entering people's body through their nose. The virus c

You clearly have not read much biology - this disease is a symptom of the presence of problematic protein entering people's body through their nose. The virus can replicate and spread from your nose without becoming symptomatic or spreading to other systems. Intramuscular vaccines do not prevent replication of proteins in your nasal passage, which is how covid spreads. Vaccines prevent symptomatic disease in most cases for most variants prior to omicron. Nasal administered vaccines like radvac still for work this reason.