AI Article Synopsis
- The study investigates the decline of streptococcal toxic shock syndrome (STSS) cases in Japan, particularly its connection to group A Streptococcus (GAS) strains, and aims to understand the reasons behind this decrease.
- Researchers analyzed 526 GAS isolates from STSS patients between 2019 and 2022, noting a significant decrease in the prevalence of emm1 strains after the COVID-19 pandemic began.
- The findings suggest that changes in public health measures during the pandemic, such as mask-wearing, may have reduced infections, particularly those from strains linked to pharyngeal infections, contributing to the reduction in STSS cases.
Article Abstract
Objectives: Streptococcal toxic shock syndrome (STSS) is caused by group A Streptococcus (GAS; Streptococcus pyogenes) strains. In Japan, the number of STSS cases has decreased; however, the underlying reason remains unclear. Moreover, information on distribution and prevalence of specific emm types in STSS cases is scarce. Hence, we investigated the reason for the decreased number of STSS cases in Japan.
Methods: We genotyped emm of 526 GAS isolates obtained from 526 patients with STSS between 2019 and 2022. The distributions of emm types in each year were compared.
Results: The emm1 type was predominant, with the highest proportion in 2019, which decreased after 2020 following the onset of the coronavirus disease 2019 (COVID-19) pandemic. Strains isolated during the pandemic correlated with strains associated with skin infection, whereas those isolated during the prepandemic period correlated with strains associated with both throat and skin infections. The decrease in the annual number of STSS cases during the COVID-19 pandemic could be due to a decreased proportion of strains associated with pharyngeal infections.
Conclusions: Potential associations between pandemic and STSS numbers with respect to public health measures, such as wearing masks and changes in healthcare-seeking behavior, may have affected the number of GAS-induced infections.
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| http://dx.doi.org/10.1016/j.ijid.2024.01.021 | DOI Listing |
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