Multiple choice Which of the following is not a cause for the spread of swine flu? Coughing Drinking impure water Sneezing None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation Swine flu (H1N1) spreads primarily through respiratory droplets when an infected person coughs or sneezes. Drinking impure water is not a transmission mode for influenza viruses, which is why it's the correct 'not a cause' answer.