One in 784,000. That's the annual risk of a child less than 10 years of age contracting a fatal case of tetanus in the U.S. in the 21st century. That's 0.0001% in the absence of mass vaccination.
So...what are the risks of tetanus vs. the vaccine risks of the DTaP (diptheria, tetanus and pertusiss) vaccine?
Read about them here:
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vaccines#