Regarding Schick's test which of the following is false?
The false statement regarding Schick test is that Positive test means that person is immune to Diphtheria. Schick test: 1.Type- Neutralization test (Toxin - antitoxin). 2.Use- It is used to find the immune status for diphtheria, Intradermal test readings are at 1-2 days and 5-7 days, but not in use because safer toxoid preparations are available. Interpretation of the test: Schick test-Positive means that person is susceptible to Diphtheria. So vaccine was administered. Schick test-Negative means that person is immune to Diphtheria. Schick test - Pseudo-positive: when there is only erythema and it disappears within 4 days. Reaction in both arm indicates person is immune but hypersensitive to the toxin. Schick test - Combined reaction: Initial picture is like that of the pseudo-reaction but the erythema fades off after 4 days only in the control arm. It progresses on the test arm to a typical positive. The person is both susceptible and hypersensitive.