Which of these claims CANNOT be inferred from this passage?

While smallpox is a deadly disease that once was very widespread, it is currently considered eradicated and any threat it poses is merely speculative. Scientists and government officials are discussing whether or not to destroy the vaccines and it is a complex issue. The passage provides information about the severity and impact of smallpox, but it does not compare it to other diseases or make a direct claim about it being the most deadly disease threatening world health.