Swine flu is a respiratory sickness caused by an influenza virus that mainly infects pigs.

VOA: special.2009.04.29

Each year,scientists work to develop a unique influenza vaccine to protect people against the strain expected in the coming flu season.

VOA: standard.2010.07.21

Operations for people were postponed because facilities and medical practitioners were preoccupied and needed to serve influenza like diseases or flu in particular,".

VOA: standard.2009.09.04

"There are parts of the flu virus that could be the target of what we would hope eventually could be a universal influenza vaccine."

VOA: standard.2010.07.21

Mexico has the highest number of deaths and infections of the flu, which is caused by a new strain of the influenza A H1N1 virus.

VOA: standard.2009.05.08

In the United States, the number of confirmed influenza cases continues to rise, but most flu sufferers report relatively mild symptoms, and only one death has been recorded.

VOA: standard.2009.05.03

U.S.officials worry that, even if the virus' spread is eventually contained, it could re-emerge months from now during the northern hemisphere's winter flu season, when more than 30,000 Americans die each year from common influenza.

VOA: standard.2009.05.03

This is welcome news for U.S.health officials, who initially had to consider the possibility that the new flu strain's impact could mirror the devastation of the 1918 influenza pandemic that led to tens of millions of deaths worldwide.

VOA: standard.2009.05.03

The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21