TABLE 4. Number of malaria cases, by Plasmodium species and year — United States, 2014–2018.
| Species | 2014 |
2015 |
2016 |
2017 |
2018 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. | (%)* | (%)† | No. | (%)* | (%)† | No. | (%)* | (%)† | No. | (%)* | (%)† | No. | (%)* | (%)† | |
|
P. falciparum
|
1,141 |
(66.1) |
(74.9) |
1,025 |
(67.3) |
(77.2) |
1,419 |
(68.3) |
(76.6) |
1,523 |
(70.5) |
(78.7) |
1,273 |
(69.8) |
(79.2) |
|
P. vivax
|
230 |
(13.3) |
(15.1) |
180 |
(11.8) |
(13.6) |
251 |
(12.1) |
(13.6) |
216 |
(10) |
(11.2) |
173 |
(9.5) |
(10.8) |
|
P. ovale
|
90 |
(5.2) |
(5.9) |
63 |
(4.1) |
(4.7) |
99 |
(4.8) |
(5.3) |
119 |
(5.5) |
(6.2) |
95 |
(5.2) |
(5.9) |
|
P. malariae
|
47 |
(2.7) |
(3.1) |
48 |
(3.2) |
(3.6) |
61 |
(2.9) |
(3.3) |
55 |
(2.6) |
(2.8) |
48 |
(2.6) |
(3) |
|
P. knowlesi
|
0 |
(0) |
(0) |
0 |
(0) |
(0) |
0 |
(0) |
(0) |
0 |
(0) |
(0) |
1 |
(0.1) |
(0.1) |
| Mixed |
15 |
(0.9) |
(1) |
12 |
(0.8) |
(0.9) |
23 |
(1.1) |
(1.2) |
22 |
(1) |
(1.1) |
17 |
(0.9) |
(1.1) |
| Undetermined |
202 |
(11.7) |
—§ |
196 |
(12.9) |
— |
225 |
(10.8) |
— |
226 |
(10.5) |
— |
216 |
(11.9) |
— |
| Total | 1,725 | (100) | (100) | 1,524 | (100) | (100) | 2,078 | (100) | (100) | 2,161 | (100) | (100) | 1,823 | (100) | (100) |
* Percentage among all infections.
† Percentage among infections with known species.
§ Not applicable because undetermined species were excluded from the calculation.