AMI IMAGES / DR. FRED MURPHY / SCIENCE PHOTO LIBRARY AMI IMAGES / DR. FRED MURPHY / SCIENCE PHOTO LIBRARY
H3N2 flu virus particles. Negatively stained transmission electron micrograph (TEM) of a section through H3N2 influenza (flu) virus particles (virions). H3N2 is a subtype of the influenza A virus. Influenza A can infect multiple species and is the most virulent human pathogen of the three influenza types (A, B and C), meaning that it has the potential to cause a pandemic. N3N2 was responsible for the flu pandemic of 1968-1969, which infected an estimated 50,000,000 people in the United States, killing 33,000.
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