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Officials say they have notified all of the victims . " On the surface , the reproductive workings of viruses are extremely complicated as , over time , they have evolved subtle and intricate ways to camouflage themselves or otherwise circumvent the immune defenses of their hosts . Students are encouraged to come in before school if they have problems with the assignment . Ovenbirds require several hundred acres of unbroken , mature forest for successful breeding , and they have evolved to procure all the necessary elements from that one habitat in the summer . We are in the process of reviewing all collaborations using stored samples from both active and inactive studies by intramural clinical scientists to ensure that they have appropriate approval and documentation . When we have problems , they have problems . In ST 's defense , they have tried to alter their plans to meet the concerns of the various communities that their surface rail will impact .