US AIR FORCE, KATHRINE MCDOWELL / SCIENCE PHOTO LIBRARY US AIR FORCE, KATHRINE MCDOWELL / SCIENCE PHOTO LIBRARY
Swine flu sample. Medical worker sealing a specimen transport bag for a sample of mucus from a patient thought to be infected with the H1N1 (swine flu) influenza virus. The specimen will be used for a culture sample and rapid testing. Swine flu is a respiratory disease of pigs caused by type A influenza viruses. This H1N1 strain is able to spread from human to human, and was declared a pandemic on 11 June 2009. Symptoms are similar to those of regular human flu. Photographed at Shaw Air Force Base, South Carolina, USA, on 3 June 2009.
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