They are like cockle burrs that "grab" hold of your clothing or a dog's coat. They are hijackers. Once they get attached to the cell of a living cell, they can take it over and "make" the living cell produce virus particles instead of cell parts. These particles can assemble into more viruses and then they break out of the cell (killing it) and begin the process again. They cannot make more viruses on their own. This hijacking causes various diseases because the cells can't do their job.
They subvert the function of cells and kills them.
Viruses can affect animals, and some viruses can affect plants.
Just about anyone who gets the flu. Most of the influenza viruses that cause disease in humans are Type A influenza viruses (but not all). Type A flu viruses are also what cause pandemics in humans.
viruses
pathogens
retroviruses
Yes they do
Yes, many viruses cause disease.
Viruses can affect animals, and some viruses can affect plants.
Viruses and bacteria that cause disease are known as pathogens. Some examples are herpes simplex virus and Mycobacterium tuberculosis.
Microorganisms that cause disease are known as pathogens, such as bacteria, viruses and fungi.
While most viruses co-exist harmlessly in their host and cause no signs or symptoms of disease, many of the viruses do cause fever.
Yes, animals get viruses just like humans does it is a pathogenic disease that is transmitted by a molecule