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Colorized transmission electron micrograph of influenza A/H3N2 virus particles, isolated from a patient sample and then propagated in cell culture. Influenza A virus particles adapt shape—as filaments and spheres—to help them infect cells depending on environmental conditions. A group of virus particles exhibiting these diverse shapes have been highlighted in gold. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H1N1 virus particles. Image captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H1N1 virus particles. Image captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H3N2 virus particles, isolated from a patient sample and then propagated in cell culture. Influenza A virus particles adapt shape—as filaments and spheres—to help them infect cells depending on environmental conditions. A group of virus particles exhibiting these diverse shapes have been highlighted in gold. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H3N2 virus particles, isolated from a patient sample and then propagated in cell culture. Influenza A virus particles adapt shape—as filaments and spheres—to help them infect cells depending on environmental conditions. A group of virus particles exhibiting these diverse shapes have been highlighted in teal. Credit: NIAID
See related February 10, 2025 news release, "Influenza A Viruses Adapt Shape in Response to Environmental Pressures," at www.niaid.nih.gov/news-events/influenza-viruses-adapt-sha...
3D renditions of three respiratory viruses: COVID-19 (left), RSV (center; oblong shape), and flu (right). Credit: NIAID
3D renditions of three respiratory viruses: COVID-19 (left), RSV (center; oblong shape), and flu (right). Credit: NIAID
Colorized transmission electron micrograph of influenza A/H1N1 virus particles (yellow). Influenza A/H1N1 can infect both humans and animals, including birds and pigs, and is one of several strains related to seasonal flu outbreaks. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H1N1 virus particles (green). Influenza A/H1N1 can infect both humans and animals, including birds and pigs, and is one of several strains related to seasonal flu outbreaks. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H1N1 virus particles (blue). Influenza A/H1N1 can infect both humans and animals, including birds and pigs, and is one of several strains related to seasonal flu outbreaks. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized transmission electron micrograph of influenza A/H3N2 virus particles (teal), isolated from a patient sample and then propagated in cell culture. Influenza A can infect both humans and animals, including birds and pigs. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Colorized transmission electron micrograph of influenza A/H3N2 virus particles (pink), isolated from a patient sample and then propagated in cell culture. Influenza A can infect both humans and animals, including birds and pigs. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Colorized transmission electron micrograph of influenza A/H3N2 virus particles (green), isolated from a patient sample and then propagated in cell culture. Influenza A can infect both humans and animals, including birds and pigs. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Influenza B virus particles (blue), isolated from a patient sample and then propagated in cell culture. Both influenza A and B can cause seasonal flu; however, unlike influenza A virus, which can also infect animals, influenza B only infects humans. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Influenza B virus particles (gold), isolated from a patient sample and then propagated in cell culture. Both influenza A and B can cause seasonal flu; however, unlike influenza A virus, which can also infect animals, influenza B only infects humans. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Influenza B virus particles, isolated from a patient sample and then propagated in cell culture. Both influenza A and B can cause seasonal flu; however, unlike influenza A virus, which can also infect animals, influenza B only infects humans. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Influenza B virus particles (purple), isolated from a patient sample and then propagated in cell culture. Both influenza A and B can cause seasonal flu; however, unlike influenza A virus, which can also infect animals, influenza B only infects humans. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Influenza B virus particles (green), isolated from a patient sample and then propagated in cell culture. Both influenza A and B can cause seasonal flu; however, unlike influenza A virus, which can also infect animals, influenza B only infects humans. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized in Halloween-appropriate colors. Stay safe this Halloween!
Colorized transmission electron micrograph of influenza A virus particles, colorized gold, isolated from a patient sample and then propagated in cell culture. Influenza A can infect both humans and animals, including birds and pigs.
More specifically, this image features the H3N2 influenza strain, isolated from a patient in Victoria, Australia, in 1975. Notable for forming both spherical particles/virions (pictured) and filamentous virions, this historical strain can be employed to study the breadth of the immune response elicited by universal flu vaccine candidates. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID
Colorized transmission electron micrograph of influenza A virus particles, colorized orange and gold, isolated from a patient sample and then propagated in cell culture. Influenza A can infect both humans and animals, including birds and pigs.
More specifically, this image features the H3N2 influenza strain, isolated from a patient in Victoria, Australia, in 1975. Notable for forming both spherical particles/virions (pictured) and filamentous virions, this historical strain can be employed to study the breadth of the immune response elicited by universal flu vaccine candidates. Microscopy by John Gallagher and Audray Harris, NIAID Laboratory of Infectious Diseases. Credit: NIAID