The leading U.S. beryllium producer said in a conference call it has traditionally been pro-active regarding the workplace disease , a lung ailment which can affects a small percent of people whose immune systems are susceptible .
<response> The leading <location>U.S.</location> beryllium producer said in a conference call it has traditionally been pro-active regarding the workplace disease , a lung ailment which can affects a small percent of people whose immune systems are susceptible . </response>