Illustration of a targeted virus over a world map
The Hunt for a Pandemic’s Origins
Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.
The Hunt for a Pandemic’s Origins
The Hunt for a Pandemic’s Origins

Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.

Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.

H1N1
Illustration of a world map showing a truck going from the US to Mexico, a plane going from Europe to Mexico, and a pig surrounded by various viruses in Mexico
Infographic: How H1N1 Came to Spark a Pandemic in 2009
Martha Nelson | Jan 4, 2022
The pathogen known as swine flu evolved in pigs in Mexico following imports of the livestock from the US and Europe.
An illustration with a world map, pigs, and viruses
Timeline: Investigating the Origins of the 2009 Pandemic
Martha Nelson | Jan 4, 2022
Seven years of surveillance and research revealed the complex history of the H1N1 virus that leapt from pigs to humans and sparked the global swine flu outbreak.
a veterinarian in a white hazmat suit holding a small pig
The Long Journey to Resolve the Origins of a Previous Pandemic
Martha Nelson | Sep 2, 2021
Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.
Climate Change May Hamper Response to Flu: Study
Carolyn Wilke | Feb 5, 2019
Mice exposed to heat wave temperatures ate less and showed weakened immune responses to the virus.
Hope for Universal Flu Vax?
Jef Akst | Aug 26, 2015
Two studies point to the possibility that a single vaccine could protect against every strain of flu virus.
On the Flu Vax–Narcolepsy Link
Anna Azvolinsky | Jul 1, 2015
Researchers identify a peptide present in the swine-flu vaccine linked to narcolepsy that may be responsible for the sleep disorder.