eggs, wheat, soy, peanuts, tree nuts, fish and shellfish. that is just the top eight. it extends beyond that. >> as a mom you find out the hard way. >> we found out when ryan was 1 and tried milk for the first time. he was deathly sick from just a few drops of milk. >> so now we're on a dairy kick, to avoid dairy. what did he drink? ? soymilk. >> just like that? >> yes. >> it's a national effort. not just baltimore? >> absolutely. there's more than 50 events across the country throughout the year. for the fan walk for food allergy. you can find information about the event at foodallergywalk.org. >> what are the foods you are hearing about? we have of course the peanut butder, shellfish, dairy. what else have you heard? >> in terms of allergies? >> yes. >> strawberries, water melon, a lot of peanuts and tree nuts that i come across. >> how about you, jim? >> there's a variety of ones beyond the top eight. some other countries were starting to see sesame and things along that pop up. in fact there was a study done published earlier this year that showed peanut and tree nut allergy alone tripled between 1997 and 2008. >> so what are the signs that we should get to a doctor?