H1N1 Flu Facts & Figures
The H1N1 flu is a new influenza virus that was first detected in people in the United States in April 2009. Originally, this virus was referred to as "swine flu" because initial laboratory testing indicated that many of the virus' genes were similar to genes present in viruses that occur in pigs. However, further research indicated the virus is, in fact, quite different from that which circulates in pigs. As of late 2009, the virus was still spreading from human to human in much the same way as ordinary influenza viruses, inlcuding through coughing or sneezing. According to the Centers for Disease Control and Prevention, those infected with the H1N1 virus may be able to infect others from one day before getting sick to 5 to 7 days after.