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Outbreak of Scabies at Geriatric Long-Term Care Facilities in Korea.
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Mo Ran Ki, Hyun Jin Moon, Hyoun Cho
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Korean J Epidemiol. 2006;28(1):100-111.
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Abstract
OBJECTIVES
To investigate an outbreak of scabies that occurred in geriatricfacilities located in Kyounggi-province, Korea, between September 2004 and September 2005.METHODS We carried out an epidemiologic investigation on the scabies outbreak. All workers except two were interviewed and the charts of the patients were reviewed.RESULTS Among workers, the attack rate was 58.6% (17/29).
The rate was 86.0%(37/43) in patients. Secondary cases also occurred among the family members of workers, with a secondary attack rate of 15.8%. The 95% confidence interval was 6%~31.3%. The transmission of scabies began from one index case who had scabies and moved from another facility.
She was hospitalized on the 4th floor of this facilitywhere dependent patients resided. After the activities (picnic and yard sale) in May 2005, and the ward rotation of care givers between the 3rd and 4th floor in July 2005, the incidence of scabies increased. The last cases occurred in Sep. 2005.CONCLUSIONS This outbreak investigation has importance because it is the first report of ascabies outbreak in geriatric long-term care facilities in Korea. Recently, the reports on a scabies epidemic are increasing with the augmentation of geriatric long-term care facilities. It is important to educate and inform workers and staff in long-term care facilities about scabies and other contagious skin diseases. More facilities for senility and dementia will be opened and we need to lookinto contagious diseases in long-term care facilities.
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Modeling and Simulations for Infectious Diseases.
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Mo ran Ki
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Korean J Epidemiol. 2006;28(1):64-68.
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Modeling and simulations of infectious diseases are useful tools to estimate epidemic size and determine effective intervention methods. Models are idealized, simplified representations of reality. Therefore, a simple model should be the first design, with complex models always able to be added later to better represent reality. The following recommendations are made to ensure accurate simulations: (1) minimal feasible complexity, (2) mathematically well-defined, models should be constructed with well characterized stochastic processes rather than 'ad-hoc'behavioral models, (3) if predictions are being made, unknown parameters need to be robustly estimated using the model from epidemiological data, (4) where data is unavailable, a detailed sensitivity analysis needs to be undertaken, and (5) even if models are only being used to explore dynamics, sensitivity analysis is important to understand mechanisms. For the effective control of infectious diseases with models and simulations, we need effective information systems (laboratory and clinical data) for communicable disease control as a permanent infrastructure, closer collaboration between academic and service providers on new developments in communicable disease control, and enhanced monitoring of veterinary infections and 'minor' zoonoses, particularly in resources poor settings.
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Epidemiological Study on the Mumps Epidemic: In one Primary School in Hwasung-Kun, Kyonggi-Do.
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Joung Soon Kim, Bo Youl Choi, Hung Bae Park, Young Jon Shin, Jeong Il Son, Mo Ran Ki, Yong Wha Oh, Keum Nie Bang, In Suk Choi
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Korean J Epidemiol. 1995;17(1):105-115.
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In the last years, according to the increasing incidence of measles and other viral diseases, it have been needed to study on not only the fundamental epidemiological characteristics of mumps and measles but also judgement on the effectiveness of vaccine that meet our domestic situation. The author carried out questionnaire to obtain epidemiological characteristics and vaccine efficacy of mumps on epidemics of mumps in one primary school in Hwasung-kun, Kyonggi Do from Feb. to July, 1994. The results are summarized as follows: 1. Total students was 556, but 446(78.4%) responded to the questionnaire. Among that 446,130(29. 1%) have suffered from mumps. From 9 to 10 year old students had the high attack rates, especially 10 year olds has the highest(39. 7%). 2. From Feb. 2, 1994, first case was on, to July 6, 1994, the epidemic was continues, and attack rate was higest in May(50. 5%). 3. Among the 130 mumps patients, 5 have suffered from complication(3.8%) : encephalitis 3(2 in male, 1 in female). 4. Vaccination rate was 91%, and as ages were lowered, the rates were higher. 5.
Attack rate was higher in group who had time interval after vaccination less than 5 years than total attack rate, and was higher in group who had been vaccined after 5 year old.
6. Attack rate in vaccinated group was 27.3%. 7. Vaccine efficacies, be judged by three methods of analysis according to case definition and vaccination status, were 37.4 39. 2%.
8. Factors that have significantly affected the mumps epidemic were vaccination status and vaccination age.
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