CloudCry by Sydney J. Van Scyoc

Used; Hardcover - Excellent; 1st Book Club Edition; Dust Jacket has some wear. 

Verrons, the interstellar explorer, is infected with the dread "bloodblossom" disease, and exiled to the quarantine planet. But Verrons is not the kind of man to stay quietly in a depressing little colony of dying men and other humanoids. Together with Wells, a human from the ice-planet Talberon, and Tiehl, a bird-man alien, he strikes out across the surveyed-but-unexplored wilderness of the planet. All of them are cynical about the prospects of a cure and determine to live or die on their own.