Volume 29, Number 9—September 2023
Dispatch
Prevalence of Asymptomatic Mpox among Men Who Have Sex with Men, Japan, January–March 2023
Table
Characteristics among cases in a study of prevalence of asymptomatic mpox among men who have sex with men, Japan, January–March 2023*
Case no. | Classification | HIV status | Sample type | Ct value | Timeframe, d |
Symptoms | ||||
---|---|---|---|---|---|---|---|---|---|---|
Sexual activity to diagnosis | Sexual activity to symptom onset | Negative test to symptom onset | Symptom onset to diagnosis | Negative test to diagnosis | ||||||
1 | Asymptomatic | On PrEP | Anorectal swab | 21.2 | 10 | NA | NA | NA | NA | NA |
2 | Asymptomatic | HIV | Pooled† | 20.8 | 29 | NA | NA | NA | NA | NA |
3 | Asymptomatic | On PrEP | Pooled† | 28.4 | ND | NA | NA | NA | NA | NA |
4 | Symptomatic‡ | HIV | Pooled† | 28.8 | 8 | 11 | NA | NA | NA | Skin lesions |
5 | Symptomatic§ | On PrEP | Pooled† | 31.0 | 48 | 8 | NA | NA | NA | Fever and pharyngitis |
6 | Symptomatic¶ | HIV | Skin lesion swab | ND | 22 | 15 | 32 | 7 | 39 | Skin lesions |
7 | Symptomatic¶ | On PrEP | Skin lesion swab | ND | 23 | 18 | 48 | 5 | 53 | Skin lesions, fever, lymphadenopathy, and pharyngitis |
8 | Symptomatic¶ | On PrEP | Skin lesion swab | ND | 18 | 9 | 13 | 9 | 22 | Skin lesions, fever, lymphadenopathy, and pharyngitis |
9 | Symptomatic¶ | HIV | Skin lesion swab | ND | 8 | 4 | 53 | 4 | 57 | Skin lesions and lymphadenopathy |
*Ct, cycle threshold; NA, not applicable; ND, no data; PrEP, preexposure prophylaxis. †Samples consisted of anorectal swabs, initial stream urine, and gargle rinse. ‡Initially asymptomatic but had symptoms develop during study. §Initially asymptomatic, but patient later reported previous self-resolving symptoms. ¶Initially tested negative but had symptoms develop during study.
1These authors contributed equally to this article.