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- From: mdiffin@crc.ac.uk (Dr. M.C. Diffin)
- Subject: Re: What homing device does a virus use?
- Message-ID: <1992Nov18.052415.29134@crc.ac.uk>
- Sender: news@crc.ac.uk
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- Organization: MRC Human Genome Resource Centre
- References: <1e8fusINNqmc@im4u.cs.utexas.edu> <17491@pitt.UUCP> <lgihacINN6hm@peaches.cs.utexas.edu>
- Date: Wed, 18 Nov 1992 05:24:15 GMT
- Lines: 32
-
- In article <lgihacINN6hm@peaches.cs.utexas.edu> turpin@cs.utexas.edu (Russell Turpin) writes:
- >-*----
- >In article <17491@pitt.UUCP> geb@cs.pitt.edu (Gordon Banks) writes:
- >> The same way that plant seeds distinguish soil from rocks: they don't, ...
- >
- >For once, you lose me. Seeds clearly do distinguish soil from
- >rocks: they grow in the former and die on the latter. I suspect
- >either of us could even make a reasonable explanation of the
- >mechanisms involved. Now ... What are the mechanisms in the case
- >of the question I posed?
- >
- >Russell
-
- Viruses tend to have specific target tissues independent of the route of
- entry, eg rabies is generally transmitted by bites, but the skin is not
- attacked (the virus is retrogradely transported by nerves to the CNS
- where it binds to ACh receptors). Similarly, HSV is retrogradely
- transported to a ganglion where it resides until some stimulus causes it
- to move back and cause the patent infection.
-
- *Very* simply, most viruses obey the following:
-
-
- 1. Primary contact (faecal/oral, serum &c)
- 2. Viraemia (virus particles multiply & are distributed in circulation)
- 3. Infection of target tissue (specific virus/receptor interaction)
- 4. Disease (clinical or latent)
- --
- ___________________________________________________________________________
- Michael Diffin
- JANET: mdiffin@uk.ac.mrc-crc PHONE: +44 (0)345 333111 Pager No. 0406653
- INTERNET: mdiffin@mrc-crc.ac.uk, mcd12@phx.cam.ac.uk
-