Figure: 4 TAC §35.2(b)(2)(A)

Figure: 4 TAC §35.2(b)(2)(A)

Test Interpretation	Non-Strain 19 Vaccinated	Strain 19 Vaccinated
Negative	1 + 1:10 or lower	1 + 1:10 or lower
Suspect	2 + 1:10 through 2 + 1:20	2 + 1:10 through 4 + 1:20
Reactor	2 + 1:20 or higher	1 + 1:40 or higher

Degree of fixation of complement: 1 + = 25%; 2 + = 50%; 3 + = 75%; 4 + = 100%