Virus

4. System: The body's defense mechanism against viruses and other pathogens.
5. Many viruses, including the flu virus, primarily infect the __________ system.
6. Medications that are effective against bacteria but not viruses.
7. Viruses need a living ________ to reproduce and multiply.
10. The process by which viruses make copies of themselves inside host cells.
11. Viruses are __________ agents that can cause diseases in living organisms.
12. Coat: The outer layer of a virus, made up of proteins, is called a ________.

1. An outbreak of a disease that occurs over a wide geographic area and affects an exceptionally high proportion of the global population.
2. Material: Viruses contain either DNA or __________ as their genetic material.
3. Viruses are so small that they can only be seen with a _________.
8. The indications or signs of a viral infection, such as fever, cough, or sore throat.
9. A weakened or inactivated form of a virus that is used to stimulate the immune system, providing immunity against the disease.