Complementary algorithm for serological testing of specimens with an initial IgM-positive or indeterminate result 5 Collect an adequate serum sample within.

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Complementary algorithm for serological testing of specimens with an initial IgM-positive or indeterminate result 5 Collect an adequate serum sample within 7 days of rash onset. 6 Collect an adequate serum sample in the convalescent phase,14-21 days after the sample from the acute phase. 7 Follow the criteria for test interpretation. 8 Evidence indicates an recent infection (either wild type or a vaccine strain). 9 Correlate with IgG avidity results. Source: Pan American Health Organization. Guidance for testing of measles and rubella in the Laboratory Network of the Region of the Americas. Washington, D.C.: PAHO; 2018. in press.