Some of the material below was reported by Rick, to whom my thanks, in July, 2012. See:
Harris et al. write :
"Severe influenza was associated with PD (odds ratio [OR]: 2.01; 95% confidence interval [CI]: 1.16-3.48), although this effect was attenuated when reports were restricted to those occurring 10 or more years before diagnosis.
Childhood illnesses were inversely associated with PD, particularly
red measles (OR: 0.65; 95% CI: 0.48-0.90).
Several animal exposures were associated with PD, with statistically significant effects for
cats (OR: 2.06; 95% CI: 1.09-3.92) and
cattle (OR: 2.23; 95% CI: 1.22-4.09)."
Harris et al.  write:
"While ever being occupationally exposed to WBV [Whole-body vibration] was inversely associated with Parkinson's disease (odds ratio = 0.67, 95% confidence interval: 0.48, 0.94), higher intensities had consistently elevated odds ratios, with a statistically significant effect being noted for intermediate intensities when exposures were restricted to the 10 years or more prior to diagnosis."
So as to keep everything in one place, I've copied the two items below from my recent posting to another thread.
I can't find a clear picture of the relationship between PD and alcohol, but a feature article in Neurology Review  says:
"People who moderately consume beer may reduce their risk of developing Parkinson’s disease by 27%, compared with nondrinkers."
The picture with green tea is also unclear, but Quintana  states:
"There was a clear protective effect of tea consumption in the pooled risk estimate [OR: 0.83 (95% confidence interval 0.74 to 0.92)] with 2215 cases and 145578 controls."
 "Association of Parkinson's disease with infections and occupational exposure to possible vectors."
Harris MA, Tsui JK, Marion SA, Shen H, Teschke K.
Mov Disord. 2012 Aug;27(9):1111-7. doi: 10.1002/mds.25077. Epub 2012 Jul 2.
 "Occupational exposure to whole-body vibration and Parkinson's disease: results from a population-based case-control study."
Harris MA, Marion SA, Spinelli JJ, Tsui JK, Teschke K.
Am J Epidemiol. 2012 Aug 15;176(4):299-307. doi: 10.1093/aje/kws017. Epub 2012 Jul 12.
 "Does Alcohol Consumption Reduce the Risk of Parkinson’s Disease?"
Neurology Reviews, 2011;19(12)14-15.
 "Parkinson's Disease and Tea: A Quantitative Review"
José Luis Barranco Quintana, MD, MPH,
Mohamed Farouk Allam, MPH, PhD, Amparo Serrano Del Castillo, MD, PhD and
Rafael Fernández-Crehuet Navajas, MD, PhD
J Am Coll Nutr February 2009 vol. 28 no. 1 1-6