Under the microscope, flu viruses take on shapes of their own! Check out these magnified images of influenza strains:

An influenza virus particle. Image: CDC/KAT M RESEARCH
An influenza virus particle. Image: CDC/KAT M RESEARCH
A microscopic image of the influenza virus that created the 1918 flu pandemic. Image: CDC/Dr. Terrence Tumpey and Cynthia Goldsmith
A microscopic image of the influenza virus that created the 1918 flu pandemic. Image: CDC/Dr. Terrence Tumpey and Cynthia Goldsmith
An electron microscope image of the Avian or Bird Flu, H5N1, virus. Scientists believe that avian flu could one day become pandemic. Image: CDC/ Courtesy of Cynthia Goldsmith  Jacqueline Katz Sherif R. Zaki
An electron microscope image of the Avian or Bird Flu, H5N1, virus. Scientists believe that avian flu could one day become pandemic. Image: CDC/ Courtesy of Cynthia Goldsmith Jacqueline Katz Sherif R. Zaki
The swine flu virus. Image: CDC/C. S. Goldsmith and A. Balish
The swine flu virus. Image: CDC/C. S. Goldsmith and A. Balish

Learn more about the flu here: ‘The Flu and You’