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Mumps infections in the etiology of type 1 (insulin-dependent) diabetes
H Hyöty1, P Leinikki, A Reunanen
1Institute of Biomedical Sciences, University of Tampere, Finland.
Abstract:
The epidemiology of Type 1 (insulin-dependent) diabetes was studied during a period starting after an unusually sharp epidemic of mumps. The number of diabetic cases increased significantly 2-4 years after the epidemic. Incidence rates were highest in geographical areas with the highest incidence of mumps and lowest in areas with the smallest numbers of reported mumps cases. Serological studies employing EIA-assays indicated recent mumps infections more often among newly diagnosed diabetic children than among matched controls although the incidence was low (13% of patients and 4% of controls had serological markers of recent mumps). Those patients, who had had serologically verified recent mumps had more often HLA-DR4 associated risk antigens (Dw4 and Dw14) than other patients. Also clinical history of mumps was obtained more often from diabetic children than from controls as 27% of the patients and 14% of the controls had had clinical mumps during the five years preceding the diagnosis of diabetes. These results confirm several earlier reports suggesting a connection between mumps and Type 1 diabetes and that the onset of diabetes may be delayed by several years.
Insights
Mumps epidemics may trigger Type 1 diabetes onset in children years later, particularly in areas with high mumps incidence. This suggests a potential viral link to diabetes development.
Area of Science:
- Epidemiology
- Virology
- Immunology
Background:
- Type 1 diabetes is an autoimmune condition with complex etiology.
- Viral infections have been implicated as potential triggers for Type 1 diabetes.
- Previous studies suggested a possible association between mumps and Type 1 diabetes.
Purpose of the Study:
- To investigate the epidemiological link between mumps outbreaks and Type 1 diabetes incidence.
- To explore serological and clinical evidence of recent mumps infection in children with Type 1 diabetes.
- To assess the temporal relationship between mumps infection and the onset of Type 1 diabetes.
Main Methods:
- Epidemiological analysis of Type 1 diabetes cases following a mumps epidemic.
- Enzyme immunoassay (EIA) for detecting recent mumps infections (serological markers).
- Case-control study comparing diabetic children and matched controls for mumps history and HLA-DR4 antigens.
Main Results:
- A significant increase in Type 1 diabetes cases was observed 2-4 years post-mumps epidemic.
- Higher mumps incidence correlated with higher Type 1 diabetes rates geographically.
- Serological evidence of recent mumps was more frequent in diabetic children (13%) than controls (4%).
- Clinical mumps history was more common in diabetic children (27%) than controls (14%).
- Diabetic patients with recent mumps showed a higher prevalence of HLA-DR4 risk antigens.
Conclusions:
- The findings support a connection between mumps infection and the development of Type 1 diabetes.
- Mumps may act as a trigger for Type 1 diabetes, with a potential delay of several years between infection and diagnosis.
- Further research is warranted to elucidate the precise mechanisms linking mumps virus to Type 1 diabetes pathogenesis.