IMO, it's a cost/benefit analysis. What's the damage caused by giving a booster that was unnecessary? Compare that to the cost of regular testing to find if a

IMO, it's a cost/benefit analysis. What's the damage caused by giving a booster that was unnecessary? Compare that to the cost of regular testing to find if a vaccination is necessary when we already have an idea of what an average is for the duration of immunity/resistance given by a vaccine. It'd probably cost me $50 to get my blood drawn and sent to a lab to determine if I needed a tetanus booster. Meanwhile, just giving me the damn booster is probably like $20. Just give me the damn booster. If you've had reactions to vaccines in the past, then sure, by all means, do the blood work to determine the necessity of a booster first, but for the general population, it's probably better to just boost.