Table 1. Frequency of certain clinical and laboratory features of HGA in China versus the United States*.
| Characteristic | China, no. (%) patients† | United States, no. (%) patients‡ | p value§ |
|---|---|---|---|
| Headache | 2 (22) | 36 (82) | 0.0011 |
| Diarrhea |
7 (78) |
6 (14) |
0.0003 |
| Leukopenia | |||
| <4,500 cells/mm3 | 9 (100) | 24 (55) | 0.0097 |
|
<3,000 cells/mm3 |
8 (89) |
11 (25) |
0.0006 |
| Thrombocytopenia | |||
| <150,000 platelets/mm3 | 9 (100) | 27 (61) | 0.0442 |
| <100,000 platelets/mm3 | 8 (89) | 13 (30) | 0.0015 |
*HGA, human granulocytic anaplasmosis. †Initial case series, n = 9. ‡Culture-confirmed case series, n = 44. §By Fisher exact test.