This work is a study of the frequency of the association between sensitivity to pork meat and cat epithelia. Comparison with a reference population that was not sensitized to pork meat, shows that this association is highly significant. This suggests therefore the possibility of a crossed allergenicity. If there is a real crossed allergenicity between pork meat and cat epithelia, we suggest that this crossed allergenicity is without doubt much greater and concerns more the meats and epithelia of mammals.