The reactions to raw fruit and veg is oral allergy syndrome.
Obviously something to avoid, as it can turn serious. The highly allergic sometimes go to the extreme of never eating the food even if cooked just in case a part of the food is not cooked throughly.
Cooking the fruit /veg changes the cellulose,but only at a high temp.
Kiwi , like other fruit and food allergies are on the increase.
Kiwi is a reletively new allergy and there has only been one study on this , which was carried out by southampton hospital five years ago or so.
The study concluded that children who have kiwi allergy have be very careful to avoid, as each reactions history seems to become quicker reacting / to anaphylaxis with each exposure.
This is not usual, and is unlike any other food allergy. Its a myth that each exposure to peanut/nuts is going to cause bigger reactions each time.
Anaphylaxis occurs with other factors in to play with each individual episode.
Kiwi is related to tree pollen, and of course other fruit like banana and latex.
My son has tree pollen allergy , so this protein matches the kiwi fruit. ( according to his over reactive immune system!)
Oral allergy syptoms are of course more reactive during the tree pollen season, if the person has tree pollen allergy.
A mildly reacting person may find it easier to eat the food in the winter , rather than the summer, or have less of a reaction.
But as with all allergies of this nature caution is advised.
I do find that kiwi fruit is easy to avoid for my son in the main part , its the peanut /beans/yeast extract / dog that drive me potty!!