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" The Chinese fur industry has a long and infamous history of the worst animal welfare abuses and even killing dogs and cats for their fur , and we intend to commission DNA tests to determine if Burlington is bringing dog or cat fur into this country illegally . In central Minnesota , blue spruce sustains the greatest damage when this fungus kills branches and causes profuse exudation of resin from branch and trunk cankers . This selective replication phenotype has highlighted their use as both tumour killing agents and gene delivery vehicles , particularly to the nervous system . Thimerosal has been used as an additive in vaccines since the 1930 's because it is very effective in killing bacteria and preventing bacterial contamination in multi-dose containers .