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A virus cannot replicate on it's own and has either DNA or RNA as it's genetic material. They are much smaller than bacteria ranging from 5-300 nanometers. One of the diseases a virus can cause is Rubeola, or Measles. The symptoms for this disease usually do not appear until 7-14 days after exposure. Some symptoms include, but are not limited to: cough, fever, rash, red eyes, diarrhea; and Koplik's spots.  Getting the MMR vaccine is the most common way to prevent this disease. It is given as routine treatment in two doses. If immediate attention is needed because someone is at risk, they may be given Human Normal Immungobliln (HNIG). Once an individual contracts measles, there is not a particular treatment that is given. Individuals exposed are given vitaminn a, vitamin c, fever reducers; and are sometimes prescribed antibiotics if a bacterial infection develops while they have measles.