TABLE 6. Number and percentage of imported malaria cases, by Plasmodium species* and interval between date of arrival in the United States and onset of illness — United States, 2018.
| Interval (days) | P. falciparum No. (%) | P. vivax No. (%) | P. ovale No. (%) | P. malariae No. (%) | Mixed No. (%) | Total No. (%) |
|---|---|---|---|---|---|---|
| <0† |
153 (15.2) |
11 (8.8) |
6 (9.4) |
2 (6.1) |
1 (8.3) |
173 (14.0)
|
| 0–29 |
799 (79.6) |
41 (32.8) |
22 (34.4) |
20 (60.6) |
8 (66.7) |
890 (71.9)
|
| 30–89 |
42 (4.2) |
22 (17.6) |
10 (15.6) |
7 (21.2) |
2 (16.7) |
83 (6.7)
|
| 90–179 |
5 (0.5) |
17 (13.6) |
7 (10.9) |
3 (9.1) |
1 (8.3) |
33 (2.7)
|
| 180–364 |
3 (0.3) |
26 (20.8) |
15 (23.4) |
1 (3.0) |
0 (0) |
45 (3.6)
|
| ≥365 |
2 (0.2) |
8 (6.4) |
4 (6.3) |
0 (0) |
0 (0) |
14 (1.1)
|
| Total | 1,004 (100.0) | 125 (100.0) | 64 (100.0) | 33 (100.0) | 12 (100.0) | 1,238 (100.0) |
* This table does not include one case of P. knowlesi because of incomplete travel dates. Persons for whom Plasmodium species, date of arrival in the United States, or date of onset of illness is unknown are not included.
† Cases in this row are among patients who had onset of illness before arriving in the United States.