Johanna, here is a link for a list of burials:
http://www.rootsweb.com/~usgenweb/mo/civilwar/smallpox.htm

CONFEDERATE POW BURIALS ON
SMALLPOX ISLAND,
WEST ALTON, IL

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LISTED HERE ARE THE NAMES OF THE OFFICERS, ENLISTED MEN AND CONSCRIPTS OF THE ARMIES OF THE CONFEDERATE STATES OF AMERICA WHO DIED OF SMALLPOX NEAR THIS SPOT BETWEEN AUG 1, 1863 AND MAR. 31, 1865.

I hope this is helpful,
Fran Bolton