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rmead at chmeds.ac.nz rmead at chmeds.ac.nz
Wed Jul 19 18:16:37 EST 1995


In article <3u5ugs$6nr at tali.hsc.colorado.edu>, ak961 at freenet.HSC.Colorado.EDU (Prateek K. Lala) writes:
> 
> In a previous article, gax at wasatch.com (gax) says:
> 
>>	I would like some information concerning the different types and 
>>up to date protection methods. 
> 
> Of the four major hepatitis viral infections (A, B, C, E), vaccines are
> only available for Hep B and Hep C.  These are recombinant vaccines
> (viral surface proteins secreted by genetically engineered yeast cells).
> Vaccines are not yet available for Hep A or E, as far as I know.
> 
> In terms of general information about the viruses themselves and diseases,
> here's what I can tell you:
> 
>       _Virus_		  _Family_		_Acute/Chronic_
>     Hepatitis A		Picornaviridae		 usually acute
>     Hepatitis B		Hepadnaviridae		 can be chronic
>     Hepatitis C		Flaviviridae		 can be chronic
>     Hepatitis D		viroid (not true virus)  only with Hep B
>     Hepatitis E		Caliciviridae		 usually acute
> 
> HBV and HCV are the main concerns in North America today.  Both can be
> transmitted by contact with contaminated blood, and are major problems in
> blood banking.  The acute stage of infection involves severe hepatic
> problems, and recurring symptoms may ultimately lead to liver failure.
> Both HBV and HCV have been associated with hepatocellular carcinoma, a
> type of liver cancer.  Between 2 and 10% of HBV infected adults develop
> chronic liver disease, and maintain a carrier state.  Pregnant females
> often transmit this infection to the fetus.
> 
> Look up these viruses in any good virology book.
> 
> Prateek Lala
> 4th year Microbiology, University of Toronto
> -- 
> The mind is like a TV set... when it goes blank, it's a good idea to turn
> off the sound.   - Communication Briefings



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