When scientists compared swine flu with previous viruses they found that it was remarkably similar to those of the past. Exposure to earlier viruses has helped to provide some people with immunity to swine flu influenza. This is why older people were not being as infected as much as young people during the 2009 outbreak. Hemagglutinin is the influenza virus envelope protein and in swine flu it is what makes it different from the common influenza. The anatomy of an influenza virus can be seen in Figure …show more content…
These symptoms usually cause short-term illness and include: body aches, chills, cough, fatigue, fever, headaches, high temperature, loss of appetite, runny nose (rhinorrhea) and sore throat. To the left in Figure 2, it can be seen what symptoms occur and which body parts or organs in the human anatomy these symptoms affect. Most cases of swine flu are mild to moderate in severity; however from having these symptoms, problems like severe pneumonia could develop and result in the failure of the respiratory system, then death. Seizures have also been linked to the H1N1 flu as possible neurological complications. The fatality rate of the resent pandemic of the 2009 H1N1 swine flu virus was 0.03%, however this means that worldwide there was between 14,000 to 18,000 deaths across the period of the recent pandemic (Davidson, T,