Legal immigrants are required to have medical screening to ensure that they do not bring any contagious diseases into the United States. Illegal aliens are not screened and many are carrying horrific third world diseases that do not belong in the USA. Many of these diseases are highly contagious and will infect citizens that come in contact with an infected illegal alien. This has already happened in restaurants, schools, and police forces.
Malaria, Dengue, Leprosy, Hepatitis A-E, Tuberculosis, Chagas Diseas, HIV,
http://www.usillegalaliens.com/impacts_of_illegal_immigration_diseases.html
Not to mention, mumps, whooping cough, lice and scabies, ring worm and other serious but not necessarily deadly diseases, especially in our public schools or passed in those restaurants where they work worry free.
Add to your list cysticercosis, the encystation of the larva of the pig tapeworm, caused by ingestion of worm eggs through fecal contamination. (BTW, most epilepsy in Latin America is caused by encystation of the larvae in the brain.)
Now, before you go out to your favorite four star restaurant and shell out hundreds of dollars for a meal for you and your date, first ask the Maitre d' where the person making your salad comes from and how well he's washed his hands after using the bathroom.