### agent | virus:

Latent virus
* can hide inside host cells for a long time and then all of a sudden become active.
* continue replicating without damaging the host cell.

### agent | virus:

Macro virus
* All macro viruses have the potential to spread and cause computer-infections in the real world.
* Most macro viruses are cosmetic.
* are a relatively common type of virus
  - also very easy to create or modify
  - among the most common viruses, and they tend to do the least damage
  - another class of virus that can also be very destructive
  - basically self-replicating macros
  - by far the most common viruses out there
  - capable of propagation across different machine types and operating systems
  - computer viruses
* are currently the most common viruses
  - commonly found viruses
  - highly contagious
  - malicious macros that are executed automatically at a specific time
  - most widespread viruses nowadays
  - new to the scene but are becoming the most common type of virus found today
  - non-resident viruses
  - possible due to the nature of macros and macro languages
  - quite common, but as a general rule, they do fairly little damage
  - technically a variation of program viruses
* are the newest type of viruses
  - only viruses that infect data files
  - prevalent virus type today
* can be very destructive
  - mutate or become corrupted
  - spread by simply opening an infected document
  - therefore spread very quickly through business offices and corporations
* cause most of the infections in the world today.
* infect and spread by means of macros associated with office-automation applications
  - data files, rather than executable files
  - files, but files normally considered to be data files rather than software
  - the macros within document and spreadsheet files
* make use of the fact that many programs have programming languages built-in.
* mutate quickly.
* pose a real threat to computer users.
* use an application's built-in programming language to spread
  - own macro programming language to distribute themselves

Malicious virus
* are increasingly prevalent and spread rapidly over the Internet.
* can be dangerous to data.

Malignant virus
* can destroy files or crash their host computer.
* cause damage to a computer system, such as corrupting files or destroying data.
* do attempt to damage computer resources such as erasing a hard drive.

Mosaic virus
* are difficult to control.
* causes yellow striping or mottling of the leaves and flowers.
* is transmitted by aphids.
* produces yellowish blotches and rings on the foliage.
* serious problem for lupin production in a number of states.

Multipartite virus
* are particularly nasty because of the number of ways they can spread.
* have characteristics of both boot sector viruses and file viruses
  - some of the features of both the above types of virus

Mumps virus
* is transmitted by respiratory droplets and salivary secretions.
* rare but well recognized cause of encephalitis.

New virus
* appear almost daily
  - every day
* assemble themselves from the newly made parts and then escape to infect other cells.
* break out of the cell.
* come out every day of the year.
* leave and infected cell by budding out of the cell or lysing the cell.

Oncolytic virus
* appear to be specific for cancer cells, although more testing is needed.
* are viruses that preferably infect cancer cells.

Orthomyxovirus
* includes cell membranes
  - corpi
  - cytoplasm
  - nuclei
  - plasma membranes
  - sections
  - vacuoles
* is an animal virus
* sometimes make red blood cells stick together.

Papilloma virus
* All papilloma viruses have the same organization.
* Some papilloma viruses infect skin.

Parasitic virus
* are a type of file virus.
* attach themselves to other programs
  - programs, also known as executables
* can spread using diskettes, email, and downloads from the Internet.