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Measles-related hospitalizations and complications in Japan, 2007-2008
Hideo Yasunaga1, Yongjin Shi, Masato Takeuchi
1Department of Health Management and Policy, Graduate School of Medicine, The University of Tokyo, Tokyo. yasunagah-jyo@h.u-tokyo.ac.jp
Objective:
In the present study we aim to describe the clinical features and related complications of severe measles requiring hospitalization in Japan in 2007 and 2008.
Methods:
We extracted the records of patients diagnosed with measles between July and December in 2007 and 2008 from the Diagnosis Procedure Combination (DPC) inpatient database and the verified age distribution of patients with measles requiring hospitalization and the rate of measles-related complications. We also examined the rate of measles patients who were pregnant or had malignancies.
Results:
We identified 1,037 inpatients in 377 hospitals; 879 in 2007 and 158 in 2008. Overall, 554 (53.4%) were male. Patient age distribution showed two peaks; ≤4 years (21%) and 15-29 years (45%). Ninety (8.7%) patients had pneumonia, 22 (2.1%) had encephalitis, 7 (0.7%) had intestinal complications, 7 (0.7%) had conjunctivitis, 6 (0.6%) had meningitis, and 4 (0.4%) had otitis media. Patients aged ≤14 years were significantly more likely to have pneumonia (16.4%; p<0.001). The rate of encephalitis was relatively low in patients aged ≤14 years (0.9%) compared with those aged 15-29 years (3.0%) and those aged ≥30 years (2.0%); the difference was not statistically significant (p=0.141). Of 31 pregnant women, 10 had spontaneous abortion or stillbirth. Twenty-eight patients had malignancies.
Conclusion:
The present study adds important information to our knowledge of the clinical features of severe measles. Follow-up monitoring of the trends of this distressing disease using the DPC database will be essential.
Insights
Severe measles hospitalization in Japan (2007-2008) primarily affected young children and young adults, with pneumonia being a common complication. Pregnant women experienced adverse outcomes, highlighting the need for continued disease monitoring.
Area of Science:
- Infectious Diseases
- Epidemiology
- Public Health
Background:
- Measles is a highly contagious viral illness.
- Severe measles cases necessitate hospitalization, posing a significant public health concern.
- Understanding clinical features and complications of hospitalized measles patients is crucial for effective management.
Purpose of the Study:
- To describe the clinical characteristics of severe measles cases requiring hospitalization in Japan.
- To identify and analyze related complications in hospitalized measles patients.
- To examine demographic factors, including age, pregnancy, and malignancy, associated with severe measles.
Main Methods:
- Utilized the Diagnosis Procedure Combination (DPC) inpatient database for patient records from July to December 2007 and 2008.
- Extracted data on hospitalized patients diagnosed with measles.
- Analyzed patient demographics, age distribution, and complication rates, including those related to pregnancy and malignancy.
Main Results:
- A total of 1,037 inpatients were identified across 377 hospitals.
- Two age peaks were observed: children ≤4 years (21%) and young adults aged 15-29 years (45%).
- Common complications included pneumonia (8.7%), encephalitis (2.1%), and intestinal issues (0.7%). Pneumonia was more prevalent in younger patients (≤14 years).
Conclusions:
- The study provides valuable insights into the clinical presentation of severe measles.
- Hospitalized measles patients, particularly young adults and children, face significant complications like pneumonia.
- Continued surveillance using the DPC database is essential for tracking measles trends.
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