Oklahoma State University -- Stillwater, Okla. - Smallpox has a nasty history throughout the world. Caused by poxviruses, smallpox is one of the few disease-causing agents against which the human body’s immune system is ineffective in its defense.
Oklahoma State University -- Stillwater, Okla. - Smallpox has a nasty history throughout the world. Caused by poxviruses, smallpox is one of the few disease-causing agents against which the human body’s immune system is ineffective in its defense.
