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Resulting quantification cycle (Cq) values with immunoglobulin G (IgG) added to digital polymerase chain reaction reactions. An assay targeting the invA gene of Salmonella enterica serovar Typhimurium was applied, and 60 pg DNA was added to the reactions. For four amounts of IgG (0, 67, 130, and 190 μM), the Cq values for each positive reaction of three panels combined are shown, each circle representing one positive reaction
