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rickettsialpox : ウィキペディア英語版
rickettsialpox

Rickettsialpox is a mite-borne infectious illness caused by bacteria of the ''Rickettsia'' genus (''Rickettsia akari''). Physician Robert Huebner and self-trained entomologist Charles Pomerantz played major roles in identifying the etiology of the disease after an outbreak in 1946 in a New York City apartment complex, documented in medical writer Berton Roueché's short story, "The Alerting of Mr. Pomerantz."
Although it is not transmitted by a tick (a characteristic of spotted fever), the bacteria is a part of the spotted fever group of ''Rickettsia'', and so this condition is often classified with that group.〔(【引用サイトリンク】title=eMedicine - Rickettsialpox : Article by Julie A Ake )
==Diagnosis of the initial outbreak==
The initial outbreak of the disease took place in the Regency Park complex which had 69 apartment units organized in three groups each three stories in height, located in Kew Gardens, in the New York City borough of Queens. Physicians who had seen patients starting in early 1946 had assumed that they were dealing with an atypical form of chickenpox, but the realization was made that they were dealing with a localized epidemic of unknown origins starting in the summer of that year. Physicians canvassed the residents of the building and found that there had been 124 cases of this disease from January through October among the 2,000 people living in the complex, reaching a peak of more than 20 cases reported in July. Individuals afflicted with the condition ranged in age from 3 months to 71, males and females were equally affected and the incidence among adults (6.5% of the 1,400 above age 15) exceeded that of children 14 and under (5.3%).〔Greenberg, Morris; Pellitteri, Ottavio J.; and Jellison, William L. ("Rickettsialpox - A Newly Recognized Rickettsial Disease" ), ''American Journal of Public Health'', July 1947. Accessed July 25, 2009.〕
Individuals would first have a small lesion at the site of the insect bite, which would eventually leave a small scar. Lymph nodes would become enlarged and about a week after the initial bite patients would start to experience chills, fever and headaches, accompanied by a maculopapular rash. The rash would last for about a week, with the full progress from the lesion being encountered until recovery typically being three weeks. Several characteristics were considered from an epidemiological perspective as being correlated with the condition. Men and women were equally affected and there was no apparent connection to occupation or school attended. The individuals obtained their meals at several different sources, and other individuals who lived elsewhere and purchased their food at these same places had not been affected. The water supply and milk consumed there were tested, with no unusual findings. There were dog kennels in the area and some tenants had dogs as pets, but an inspection of the animals found no ticks or insects.〔
Many residents had reported the presence of mice in and around the apartments, especially in the basements of the buildings near the incinerators, where living and dead mice were found. Garbage disposed of through incinerator chutes was to be burned on a daily basis, with the ashes carted off by the New York City Department of Sanitation. Due to labor shortages, the material was not burned regularly, leaving ample food for the rodents. Mice were trapped in apartments and near the incinerators and antibodies to the rickettsialpox were found in their blood.〔 Visiting the complex with pest-control specialist and self-trained entomologist Charles Pomerantz, the two peeled back wallpaper to find the walls swarming with mites, so much so that tenants had said that "the walls had movement".〔Beeman, Edward A. ("Robert J. Huebner, M.D.:A Virologist’s Odyssey" ), National Institutes of Health'', 2005. Accessed July 23, 2009.〕 The mites were collected and rickettsial strains were isolated from some of them, with the name ''Rickettsia akari'' given to the organism.〔
Public health officials took steps to prevent further outbreaks of the disease. The building operators were told to ensure that the incinerators were fired on a regular basis to ensure that food available to the mice that harbored the disease was eliminated as quickly and thoroughly as possible.〔 Pest control measures were undertaken through the New York City Department of Health and its commissioner Israel Weinstein to eliminate the mice in and around the buildings with the cooperation of property owners.〔Staff. ("NEW FEVER TRACED TO MITE ON MICE; U.S. Health Service Roots Out Cause of Spotted Ailment That Struck in Queens NO CURE IS FOUND AS YET Victim Made Ill by Bite of Insect--Weinstein Urges War on Rodents Some Removed to Hospitals Blood of Patients Sampled" ), ''The New York Times'', October 4, 1946. Accessed July 23, 2009.〕
Another 20 cases of rickettsialpox were discovered elsewhere in New York City during the investigation of the Queens outbreak, including 10 cases found in an apartment building in the Bronx that had originally been diagnosed as atypical chickenpox. Mice were found in the basement of this building, as well as mites belonging to the same class found in Queens.〔 In addition to the initial cases from the first outbreak in Queens, over 500 cases of the disease were diagnosed in New York City from 1947 to 1951.〔Parola, Philippe. ("Rickettsial Diseases" ), p. 63. CRC Press, 2007. ISBN 0-8493-7611-4. Accessed July 25, 2009.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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