Rubulavirus
If not vaccinated against mumps, susceptible individuals catch the disease by breathing around an infected person who has coughed or sneezed, releasing their contaminated saliva. Those who have had mumps are usually immune to future infections of the disease. Children have the highest risk of catching mumps, and it is rare for an adult to contract mumps. The incubation period for mumps can range from a couple weeks to a month, while the illness period is a few weeks. The swelling of the salivary glands is caused when the virus travels from the respiratory tract to the salivary glands and multiplies within the glands, causing the glands to swell.
ACAM2000
Smallpox works in the following way:"Smallpox spreads from one person to another by infected saliva droplets. The incubation period is 7 to 17 days. The symptoms begin with severe headache, backache, and fever up to 40 °C, all beginning abruptly. Then a rash appears on the face and spreads, the spots become watery blisters containing pus that form scabs and leave pitted scars when they fall off. The infected person is contagious until the last smallpox scab has fallen off, although most of the transmission occurs in the first week. Most people with smallpox recover, but some do die and the risk depends on the strain of virus." In 1980, the World Health Organization certified that the naturally occurring smallpox disease was eradicated. According to the FDA, "Until ACAM2000 was licensed, Dryvax, manufactured by Wyeth Laboratories, Inc., was the only vaccine licensed by FDA. Routine vaccination of the American public was stopped in 1972 after the disease was eradicated from the United States. However, smallpox has the potential to be deliberately used as a weapon by terrorists. A large proportion of the population has no immunity and fatality rates could be higher than 25% if smallpox were to be released as a bioterrorist weapon."