The following URL address may be helpful for finding out more infomation on astroviruses:

1. United States Environmental Protection Agency (EPA) Astrovirus Information:
    http://www.epa.gov/nerlcwww/astro.htm

2. Astrovirus Home Page at the Institute for Animal Health:
    http://www.iah.bbsrc.ac.uk/virus/Astroviridae/index.html

3. Astrovirus News at the Institute for Animal Health:
    http://www.iah.bbsrc.ac.uk/virus/Astroviridae/news.htm

4. Astrovirus Sequence Database at the Institute for Animal Health:
    http://www.iah.bbsrc.ac.uk/virus/Astroviridae/astrovirusdatabase.htm

5. Human Astrovirus-EM-Laval, by Dr. Hans Ackerman:
    http://life.anu.edu.au/viruses/Images/Ackerman/Animalvi/Astrovir/551-21.htm

6. Astrovirus-EM-Queens University:
    http://www.ncbi.nlm.nih.gov/ICTVdb/Images/Queensun/vsd23_c.htm

7. Human Astrovirus-EM-Frankfurt:
    http://www.ncbi.nlm.nih.gov/ICTVdb/Images/Cornelia/astro3.htm

8. Virology Information of Astroviridae:
    http://virology.science.org/astrovirus.html

9. Family Astroviridae, Compiled for the VIth ICTV:
    http://life.anu.edu.au/viruses/Ictv/rf_astro.htm

10. Alphabetical List of ICTV Approved Virus Families and Genera:
    http://life.anu.edu.au/viruses/Ictv/vf_fst-a.html

11. Viral Agents of Gastroenteritis PH Importance and Outbreak Management:
    http://aepo-xdv-www.epo.cdc.gov/wonder/prevguid/p0000277/body0008.htm