研究のタイプ: 医学/生物学の研究 (observational study)

[携帯電話基地局設置後の子牛における核白内障の発生増加] med./bio.

[Increased occurence of nuclear cataract in the calf after erection of a mobile phone base station].

掲載誌: Schweiz Arch Tierheilkd 2012; 154 (2): 82-86

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研究目的(著者による)

It should be examined if the increased occurrence of cataract in calves on a farm in Switzerland was related to the exposure to a 1800 MHz electromagnetic field of a GSM base station.

詳細情報

The base station was erected at a distance of 20 m to the cow stable and it was active from mid-1999 to mid-2006 with short breaks (3 and 2 months). In the beginning, the increased occurrence of cataract was observed by the farmer himself. The first author, who examined the animals during a general check for cataract and took blood samples, was engaged in mid-2002. Beginning with May 2004 and until the end of the examination in June 2009, ophthalmic examinations of the animals were conducted on a regular basis. 196 animals were examined in total, of which 154 were examined in an ophthalmic manner (42 cows, 112 calves).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1,800 MHz
ばく露時間: continuous
  • 電界強度: 0.17 V/m maximum (in the stable; based on measurement from 9/12/2002)
  • 電界強度: 0.5 V/m maximum (on the farm square; based on measurement from 9/12/2002)

ばく露1

主たる特性
周波数 1,800 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous
ばく露装置
ばく露の発生源/構造
  • mobile phone base station
ばく露装置の詳細 mobile phone base station with 5 mobile channels serving 3 sectors at a height of 15.4 m was erected at a distance of 20 m to the stable; the stable was located between two main beams of the antenna
パラメータ
測定量 種別 Method Mass 備考
電界強度 0.17 V/m maximum 測定値 - in the stable; based on measurement from 9/12/2002
電界強度 0.5 V/m maximum 測定値 - on the farm square; based on measurement from 9/12/2002

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

According to the farmer's records, the occurrence of cataract increased after the erection of the base station with a latency of 12 months and decreased again after its deconstruction. In fact, new born calves showed a 3.5 times higher risk for heavy cataract compared to Swiss average in the time from 19-5-2004 to 20-6-2009.
Moreover, an increased number of eosinophils was found in 2 of 5 cattle, which indicated a reaction of the immune system, possibly due to a parasite infestation. The animals were underfed and the mold content in the food, as well as the heavy metal content, lay at the upper border of the norm. However, infections and intoxications could be excluded.
The authors conclude that there is indeed a time-based correlation of the increased occurrence of cataract in the calves and the presence of the GSM base station. However, no causal relation can be derived from that. Hence, the actual reason for the increased occurrence of cataract remains unknown and a genetic component could be involved.

研究の種別:

研究助成

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