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- Newsgroups: sci.med
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!caen!batcomputer!cornell!rochester!fulk
- From: fulk@cs.rochester.edu (Mark Fulk)
- Subject: Re: What homing device does a virus use?
- Message-ID: <1992Nov19.193058.18318@cs.rochester.edu>
- Organization: University of Rochester
- References: <17491@pitt.UUCP> <17518@pitt.UUCP> <1992Nov19.171408.10863@cbfsb.cb.att.com>
- Date: Thu, 19 Nov 1992 19:30:58 GMT
- Lines: 27
-
- In article <1992Nov19.171408.10863@cbfsb.cb.att.com> kja@cbnewsf.cb.att.com (krista.j.anderson) writes:
- >In article <17518@pitt.UUCP>, geb@cs.pitt.edu (Gordon Banks) writes:
- >> Just so the virus. It either "bumps" into a cell that is "receptive"
- >> or it doesn't. The virus has no intelligence. It depends on
- >> physics to encounter a suitable host. If it doesn't, it dies.
- >
- >How does it die? I mean, I know the immune system would kill it,
- >but is its lifespan otherwise limited? For example, outside the
- >body, what happens to a virus? Do airborn microorganisms
- >metabolize its protein coat or does it have any metabolic needs
- >without which it spontaneously decomposes or what?
-
- A variety of mechanisms can destroy a virus: UV radiation, including
- sufficient exposure to sunlight; dessication, in some cases; consumption
- by bacteria; chemical destruction (by oxygen or detergents). Some viruses
- are stable when desiccated; in fact, some have been crystallized. I believe
- that the world's remaining stocks of smallpox virus are being stored in
- freeze-dried form (they are also frozen). Generally speaking, most viruses
- survive only a few hours or days when left on an exposed surface.
-
- Viruses, pretty much by definition, don't have a metabolism, and hence
- have no metabolic needs, independently of the cells they subvert.
-
- Mark
- --
- Mark A. Fulk University of Rochester
- Computer Science Department fulk@cs.rochester.edu
-