There seems to be a typo in the term "VIRIS," as the correct spelling is "VIRUS." Therefore, I will provide you with a 200-word dictionary definition of the term "VIRUS."
A virus is a microscopic infectious agent that replicates only inside living cells of organisms. These organisms can include plants, animals, humans, or even bacteria. Viruses are known to cause disease in their host organisms, leading to various symptoms. They consist of genetic material, either DNA or RNA, surrounded by a protein coat called a capsid. The genetic material contains the instructions for producing more viruses, which hijack the host's cellular machinery to reproduce.
Viruses are highly diverse, with a wide range of different shapes, sizes, and modes of transmission. They can spread through direct contact, such as bodily fluids, or indirectly through vectors like insects. Once a virus enters a host organism, it attaches to specific receptors on the host's cells and injects its genetic material. The virus then takes control over the cellular machinery, forcing it to produce new viral proteins and genetic material. These components assemble to create new viruses, which eventually burst out of the host cell, destroying it in the process.
Many viruses are responsible for human infections and diseases, including the common cold, influenza, COVID-19, Ebola, and HIV. However, not all viruses are harmful, as some can live in harmony with their host without causing significant harm. Additionally, viruses can also be beneficial, such as bacteriophages that specifically infect and destroy bacteria, helping control bacterial populations in ecological systems.
