Differences in coagulation status of natural, nonprogressive SIV infections of AGMs and SMs and pathogenic SIV infections of RMs and PTMs. (A) Levels of DD are unchanged between uninfected and SIV-infected African NHPs, whereas they were increased significantly in chronically SIV-infected RMs and PTMs. (B) Similar changes observed by testing a second coagulation marker, TAT. P values were calculated with the Mann-Whitney U test.