<prompt> Spring catarrh is which type of hypersensitivity reaction -type Itype IItype II IIIAll  <response>: Ans. is a i.e., Type I . Vernal keratoconjuctivitis is a recurrent, bilateral, external ocular inflammation primarily affecting boys and young adults living in warm, dry climates. . It is an allergic disorder in which IgE type I and cell mediated immune mechanisms type IV play an impoant role. 