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Volume 24, Number 8—August 2018
Dispatch

Outbreak of Trichinella T9 Infections Associated with Consumption of Bear Meat, Japan

Katsushige Tada, Hiromichi Suzuki, Yosuke Sato, Yasuyuki Morishima, Isao Nagano, Haruhiko Ishioka, and Harumi GomiComments to Author 
Author affiliations: Mito Kyodo General Hospital, University of Tsukuba, Mito, Japan (K. Tada, H. Ishioka, H. Gomi); Tsukuba Medical Center Hospital, Tsukuba, Japan (H. Suzuki); Ibaraki Prefecture Mito Health Center, Mito (Y. Sato); National Institute of Infectious Diseases, Tokyo, Japan (Y. Morishima); Gifu University, Gifu, Japan (I. Nagano)

Main Article

Table 1

Serologic test results for 28 patients who consumed bear meat associated with Trichinella T9 infection, Japan, December 2016*

Patient no.
 Signs and symptoms
Highest blood eosinophil count, cells/L
 Initial serologic test titer
 No. days postinfection
 Convalescent-phase serologic test titer
 No. days after first blood collection
1 Yes 7.1 × 109 <200 23 6,400 24
2 Yes 4.3 × 109 <200 23 12,800 19
3 Yes 2.7 × 109 <200 27 1,600 20
4 Yes 10.1 × 109 <200 23 800 19
5 Yes 7.8 × 109 800 24 3,200 17
6 Yes 8.8 × 109 <200 25 1,600 17
7 Yes 3.1 × 109 <200 25 1,600 17
8 Yes 1.9 × 109 800 25 6,400 18
9 Yes 11.1 × 109 <200 25 3,200 18
10 Yes 2.4 × 109 <200 24 3,200 15
11 Yes 5.0 × 109 400 12 3,200 16
12 Yes 4.2 × 109 <200 13 800 16
13 Yes 8.5 × 109 200 22 6,400 14
14 Yes 5.3 × 109 <200 20 800 15
15 Yes 10.8 × 109 200 20 3,200 14
16 Yes 2.9 × 109 <200 23 <200 24
17 Yes 4.3 × 109 <200 21 <200 16
18 Yes 1.9 × 109 <200 20 400 13
19 No 0.1 × 109 <200 22 <200 29
20 No 0.2 × 109 <200 18 <200 15
21 No 0.1 × 109 <200 19 <200 28
22 No 0.1 × 109 <200 27 <200 24
23 Yes 2.3 × 109 <200 23 6,400 15
24 Yes 2.9 × 109 <200 23 400 16
25 No 0.4 × 109 <200 25 <200 31
26 No 0.2 × 109 <200 21 <200 14
27 No 0.1 × 109 <200 11 <200 29
28 Yes 2.0 × 109 <200 27 400 13

*ELISA was performed to detect Trichinella antigens. The cutoff point (0.148) was 3 times the mean value of A414 from the negative serum sample of 100 healthy persons. Of the 28 patients evaluated, 21 had signs and symptoms compatible with trichinellosis. Patients 1–15 also had elevated antibody titers; however, the antibody titers of patients 16 and 17 were not elevated. These cases were defined as probable trichinellosis, as previously described (8).

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Page updated: July 18, 2018
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