<prompt> Translate the following text to SwahiliIt is hard to prove that worker illness is a result of pesticide exposure in the field because other things, both on and off the job, can trigger physical symptoms, said Dr. Suzanne Wuerthele, an EPA toxicologist in Denver.  <response>: Ni vigumu kuthibitisha kwamba ugonjwa wa mfanyakazi ni matokeo ya kuambukizwa kwa dawa za kuua wadudu katika shamba kwa sababu mambo mengine, ndani na nje ya kazi, yanaweza kusababisha dalili za kimwili, alisema Daktari Suzanne Wuerthel, mtaalamu wa sumu wa EPA huko Denver. 