Yes, lock down and social isolation does work to prevent transmission but it also weakens the healthy immune systems and makes the population more fragile going

Yes, lock down and social isolation does work to prevent transmission but it also weakens the healthy immune systems and makes the population more fragile going forward. Better to inoculate the most vulnerable, not the entire population for a fast mutating respiratory virus. Polio can't really mutate and it makes a lot of sense to inoculate everyone for this.