Table 2. Molecular identification of anisakid larvae isolated from patients, Japan, 2018–2019.
| Species, isolation site | Symptomatic cases, no. |
Asymptomatic cases, no. |
Total cases, no. |
Overall, no. (%) |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Patients | Larvae | Patients | Larvae | Patients | Larvae | Patients | Larvae | ||||
| Anisakis simplex sensu stricto | 160 (88.4) | 168 (88.9) | |||||||||
| Stomach | 139 | 146*† | 18 | 19‡§ | 157 | 165 | |||||
| Intestine |
0 |
0 |
|
3 |
3‡ |
|
3 |
3 |
|
|
|
| Anisakis pegreffii | 10 (5.5) | 10 (5.3) | |||||||||
| Stomach | 9 | 9* | 0 | 0 | 9 | 9 | |||||
| Intestine |
0 |
0 |
|
1 |
1‡ |
|
1 |
1 |
|
|
|
| Pseudoterranova azarasi | 11 (6.1) | 11 (5.8) | |||||||||
| Oral cavity | 0 | 0 | 4 | 4¶ | 4 | 4 | |||||
| Stomach |
6 |
6*# |
|
1 |
1‡ |
|
7 |
7 |
|
|
|
| Total | 154 | 161 | 27 | 28 | 181 | 189 | 181 (100) | 189 (100) | |||
*Abdominal pain. †Two larvae were isolated from 5 patients and 3 larvae were isolated from 1 patient. ‡Larvae were incidentally detected endoscopically during health check-ups or routine follow-up cancer screening. §Two larvae were isolated from 1 patient. ¶P. azarasi larvae were spontaneously expelled from the mouth. #Of 6 P. azarasi patients, 1 showed urticaria in addition to abdominal pain.