Viruses

6. – A type of infection where the virus remains in the host without causing immediate symptoms
7. – A living cell or organism that a virus infects and uses to replicate.
10. – A, widespread outbreak of a disease affecting a large geographic area.
12. – A biological preparation that improves immunity to a specific disease.
13. – A lipid membrane covering found on some viruses, derived from the host cell.
14. – A type of medication used to treat viral infections.
15. – A single, complete, infectious virus particle.

1. – The mechanism by which a virus spreads from one host to another.
2. – The process by which a virus makes copies of itself inside a host cell.
3. – A change in the genetic sequence of a virus, often leading to new strains.
4. – An agent, such as a virus or bacterium, that causes disease.
5. – The genetic material of the virus, composed of either DNA or RNA.
8. – The invasion and growth of viruses within a host.
9. – The protein shell that surrounds and protects a virus's genetic material.
11. – An organism (like a mosquito or tick) that transmits a virus to humans or animals.