How do you interpret varicella titer results?

How do you interpret varicella titer results?

The varicella zoster titer range is interpreted as follows:

1. Non-Reactive: no detectable antibody (negative varicella titer)
2. Indeterminate: the level of antibody detected is considered borderline reactive or equivocal.
3. Reactive: The amount of obtained antibody is in the positive range (positive varicella titer)

What is a positive varicella titer range?

165.0 IV or greater: Positive – IgG antibody to varicella-zoster detected, which may indicate a current or past varicella-zoster infection. 0.90 ISR or less: Negative – No significant level of detectable varicella-zoster virus IgM antibody. 0.91-1.09 ISR: Equivocal – Repeat testing in 10-14 days may be helpful.

How long does varicella IgM stay positive What does it mean if IgG is positive?

After VZV infection, IgG and IgM antibodies appear 2 to 5 days after the rash and show the highest titers at 2 to 3 weeks. The VZV IgM antibody levels then rapidly decrease and cannot be detected at 1 year after infection, and the IgG antibody levels gradually decrease, showing positive test results for several years.

How long do varicella titers last?

2007 Mar 15;356(11):1121-9. Kuter B, Matthews H, Shinefield H, Black S, Dennehy P, Watson B, et al. Ten year follow-up of healthy children who received one or two injections of varicella vaccine . Pediatr Infect Dis J.

What are normal titer levels?

The normal values of an antibody titer depend on the type of antibody. If the testing is done to detect autoantibodies, the normal value should essentially be zero or negative. In the case of testing the efficacy of a vaccine, the normal test result depends on the definite value that is specific for that immunization.

How do you know if a chicken pox spot is infected?

Sometimes the chickenpox spots get infected with bacteria – probably from scratching. This is more common in children. Chickenpox spots can sometimes leave scars, especially if they become infected. Signs of a bacterial infection include a high temperature (fever) and redness and pain around the chickenpox spots.

How often do you need a varicella titer?

Those without evidence of immunity should receive 2 doses of varicella vaccine 4 to 8 weeks apart or, if previously received 1 dose, the second dose at least 4 weeks after the first dose.