Victims can transmit pneumonic plague directly via droplets in the air. Inflammation of the lungs leading to fluid leakage and loss of function of lung tissue. Although it's often associated with pneumococcus bacteria, pneumonia can be caused by a variety of microbial or chemical irritants. An acute contagious viral disease, often fatal, transmitted from contact with an infected person or their belongings. The rash usually begins in the face, progressing to chest, arms then legs.
Death occurs if at any time the virus attacks the heart, liver, or other internal organs.
One of mankind's most pernicious diseases, smallpox became the target of a worldwide vaccination effort. Sweden was the first country to be smallpox-free, in 1895. In 1979, the World Health Organization reported that, except for a few vials kept in deep freeze, smallpox had been eliminated from the earth. The administration of weakened or killed micro-organisms in order to induce or strengthen the immune response.