millions
The exact number of how many viruses exist in the world is not known because there have been some that have yet to be discovered. Also, many known viruses are also able to mutate into brand new viruses. This makes it next to impossible to get an exact count.
Biological.
Biological viruses.
I guess probably no one can answer this question .. There exists plenty of types of viruses and trust me a lot of viruses exist :)
thousands..
By analogy with biological viruses.
No. Computer viruses are only called "viruses" by figurative analogy with biological viruses. And biological viruses (such as chickenpox, hepatitis, and the flu) are not the same as disease-causing bacteria (such as strep throat, tuberculosis, and lyme disease).
While most viruses co-exist harmlessly in their host and cause no signs or symptoms of disease, many of the viruses do cause fever.
Similar to biological viruses, they have the capacity to reproduce. Also, they infect files - becoming part of the file. This is similar to biological viruses, invading the cell.Note that in popular usage, the term "viruses" is used for many types of malware (malicious programs); but a computer virus is actually only a very specific type of malware.
Both types:are spread by contact with a contaminated sourcecan be blocked with defensescan be modified and weaponisedcan go away after a time if certain measures are takencan kill whatever they infectcan change over timecan be costlyDifferences:computer viruses only work in a computer hostbiological viruses only work in a biological hostbiological viruses can spontaneously mutatecomputer viruses are createdbiological viruses are far more complex
- some viruses can be used in biological weapons- some viruses are used in the fight against pests
Biological Virus can kill youComputer Virus can just kill your computer, not you.Neither is living.*computer virus it is software which corrupt the system *biological virus which cause decease in human body