A nucleic acid vaccine
When the vaccine gets to the body the it will block away the viral infection.
Examples of antigens are poisons, splinters and microorganisms.
vaccine
There is no specific vaccine for viral pneumonia, but vaccines such as the influenza (flu) vaccine and the measles vaccine can help prevent some of the viral infections that can lead to pneumonia. It is important to practice good hygiene, get vaccinated, and seek medical attention if you develop symptoms of pneumonia.
There are a number of viral infections for which vaccines are available. Most viral infections, though, have no vaccine available.
There is currently no vaccine available against Hepatitis C. There is research going on to develop one but it will take years at least before one is developed.
a vaccine
The external viral proteins of the HPV vaccine.
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because viruses responsible for viral fever are many and mutate very rapidly.
While vaccines are mostly viral, the bacteria causing typhoid fever is also used as a vaccine.
yellow fever