During schick test what are the symptoms of positive reaction
1
An area of erythema at the injection site within 6 -24 hours and then disappear
2
An area of erythema and swelling at the site of injection in 24-48 hours and reaching maximum in 4-7 days
3
No erythema & swelling at the injection site
4
Presence of erythema in test arm and absence of crythema in control arm