also disappointed but not shocked by the anti vaccination thoughts here. it doesn't make your immune system weaker, it's provoking the exact same response in your body as if you actually got the disease, that's why it's effective. Though maybe you are right and we should go back to having 15 million deaths a year due to smallpox and 500,000 deaths from polio each year. There's a reason life expectancy has gone up so much in the past 100 years and its not because we're eating more cheeseburgers.