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

VOA: special.2009.04.29

The current spread of a swine influenza virus has added to these concerns.

VOA: special.2009.07.14

"It is quite possible with an influenza virus, a pandemic influenza virus that it gets worse over time.

VOA: standard.2009.04.30

Health officials in Mexico and the United States were puzzled by a virus that combined elements of swine, avian and human influenza.

VOA: standard.2009.12.25

"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

The news reports are likely to further crimp Mexican tourism, already in a downturn after the emergence of the swine influenza A-H1N1 virus in Mexico in April.

VOA: standard.2009.06.09

Head of the International Red Cross Federation's Influenza team, Robert Kaufman, says the impact of a novel virus on a community without immunity is not just about the number of illnesses and deaths.

VOA: standard.2009.09.04

"It does not really matter because in the best case scenario we have today,we will still have a moderate virus that is projected to cause several million deaths extra deaths than the usual influenza annual mortality, which means that even in the best-case scenario, we do have an emergency on our hand,"

VOA: standard.2009.09.04