zoonotic diseases are transmitted from animals to humans, including illnesses caused by bacteria, viruses and parasites. Rabies and variant Creutzfeldt-Jakob disease -LRB- better known as mad cow disease -RRB- are two well-known examples. 4. Should I cancel my trip to Mexico ? Yes, you should, unless it's essential. That's the advice from a recent CDC travel warning. Watch Elizabeth Cohen answer your questions 5. Should I be freaking out ? A new virus spreading quickly around the world. Young, healthy people struck dead in Mexico. Should we all be panicking ? Absolutely not, said Dr. William Schaffner, chairman of the department of preventive medicine at Vanderbilt University School of Medicine. Swine flu, he said, is not spreading all that rapidly. Take the St. Francis School in New York. There's been very little transmission from the schoolchildren to family members, and it certainly has n't spread throughout Queens. iReport.com: Share your thoughts, concerns about swine flu But, Schaffner added, this does n't mean we should n't pay attention to swine flu. We should be alert, keep up with the information coming out daily, and take control by being attentive to your hygiene. Wash your hands very, very frequently and avoid people who are coughing and sneezing. 6. How close do you have to be to a sick person to get swine flu ? You can acquire this infection if you 're