Prevalence of nuclear cataract in Swiss veal calves and its possible association with mobile telephone antenna base stations.
The purpose of this study was to valuate the prevalence of nuclear cataract in veal calves and to elucidate a possible impact by mobile phone base stations (MPBS). For this experiment a cohort study was conducted. A follow-up of the geographical location of each dam and its calf from conception through the fetal period up to slaughter was performed. The first trimester of gestation (organogenesis) was particularly emphasized. The activities of selected protective antioxidants (superoxide dismutase, catalase, glutathione peroxidase [GPx]) were assessed in aqueous humor of the eye to evaluate the redox status. Of 253 calves, 79 (32 %) had various degrees of nuclear cataract, but only 9 (3.6 %) calves had severe nuclear cataract. Results demonstrate a relation between the location of veals calves with nuclear cataracts in the first trimester of gestation and the strength of antennas. The number of antennas within 100 to 199 meters was associated with oxidative stress and there was an association between oxidative stress and the distance to the nearest MPBS. Oxidative stress was increased in eyes with cataract (OR per kilometer: 0.80, confidence interval 95 % 0.62,0.93). It has not been shown that the antennas actually affected stress. Hosmer-Lemeshow statistics showed an accuracy of 100 % in negative cases with low radiation, and only 11.11 % accuracy in positive cases with high radiation. This reflects, that there are a lot of other possibilities for nuclear cataract beside MPBS. Further studies on the influence of electromagnetic fields during embryonic development animal or person at risk are indicated.
Hässig
Michael
M
Section for Herd Health, Vetsuisse-Faculty of the University of Zürich, Zurich, Switzerland. mhaessig@vetclinics.uzh.ch
Jud
F
F
Naegeli
H
H
Kupper
J
J
Spiess
B M
BM
D000704:Analysis of Variance; D000818:Animals; D002386:Cataract / Q000453:epidemiology / Q000209:etiology / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000209:etiology*; D040421:Cell Phone; D004574:Electromagnetic Fields / Q000009:adverse effects*; D005260:Female; D008297:Male; D018384:Oxidative Stress / Q000502:physiology; D015995:Prevalence; D012044:Regression Analysis; D013557:Switzerland / Q000453:epidemiology