The document summarizes information about swine flu, including its symptoms, high risk groups, and tips for prevention. Swine flu is caused by an influenza A H1N1 virus that contains genetic components of pig and bird flu viruses, which is why humans have no immunity. Symptoms are similar to seasonal flu but may include diarrhea and vomiting. High risk groups include pregnant women, people with chronic medical conditions, and children/adults who are obese. Tips for prevention include washing hands frequently, getting sufficient sleep, eating a nutritious diet, and staying up to date on public health guidelines.