Specifically, the tetanus-diphtheria-acellular pertussis booster is among the safest of immunizations. The manufacturers warn that increased frequency of boosters "may" increase frequency of adverse effects, but there doesn't seem to be anything more concrete than speculation and caution on that part.

There are risks for significant adverse reactions (systemic anaphylactic reactions and Guillain-Barré Syndrome), but they're extremely rare (and ever rarer if you had no problem with previous shots.) There are also higher risks for more local and temporary effects (swelling/redness at the injection site, slight fever), but they're nowhere near as serious.

Thanks for the reminder, though, Al. I think most of us are at that 10-year point where we need a booster for this. Alberta Health & Wellness is kind enough to provide a page with information about the shot, and Capital Health lets you know where you can get yours (for free!)

Al, the only negative side effect to that is that you may develope an alergic reaction if you are indiscriminately exposed to something like that enough times. Thing is though, while allergies are usually considered a bad thing, in this case it's exactly what you want. It just means that when you do get infected with the tetanus toxin, you are likely to exhibit a higher fever and a few other unwarranted effects that you otherwise wouldn't have had. Good news though is that this will be a temporary effect. Since one requires booster shots for tetanus, we know that cells produced against it slowly die off and you need re-exposure for proper protection. This also means that the cells that are causing your allergic reaction probably die over time so this so called negative effects are also temporary. Get your shot, it's not gonna hurt you.

Quick question, is there any negative side effects if I get too many tetanus shots?

Man, my company pioneered the "defend your [blank]" games. For serious. We made the original "Defend Your Castle" back in the day.

Currently I'm working on the sequel, and it will be just as groundbreaking as the first.

um???

I am tired of getting an itchy mouth from eating food. GAH!

That first one didn't take me very long, however I'd like to find the second door... I think it has something to do with what's written on the easel, as that's something I didn't use in my solution.

C'mon Par! Where are the defend your (blank) games?

I guess I shouldn't introduce you guys to this one or this one, then, huh?

I finally figured that part out, but now I'm stuck again. This game is evil!